saw your other post as well, there's so much stuff in your stack that you have to narrow your issues down to the malfunctioning item, there's no way you're gonna stumble upon someone with your exact setup.
start with existing element x apps communicating over matrix.org (use throwaway accounts if you don't trust it) and unified push using ntfy.sh. if everything works there, then you can start replacing one by one of these until you achieve full functionality or something breaks.
I swear, every time I'm tired of the limitations of AOSP I inevitably begin to bargain with my conscience, like what if I just have a sandboxed play store, what if it's just microG, surely LineageOS has enough safeguards... and sure enough, within 24 hours one of these things pops up and I'm done with coveting the easy path.
aside from the obvious, wayland being the default choice on all relevant distros and DEs and being continously worked on, evermore projects switching to it (WINE most recently) whilst X11 is in maintenance-mode, the main thing for me and my deployed fleet is if you're running a modern laptop, say with a 1080p or better screen, wayland is a must. primarily because of the output (UI scaling, effortless multi-monitor dock/undock) and the input (touchpad gestures, touch screens).
if your world is a desktop with a mouse and, say, XFCE, then you have very few of these things intruding on you and you don't really ~~understand the benefits~~ benefit from it.
solid rant.
as to your thing with the addiction to this and that, you hafta learn to hate that crap; it comes naturally to me, so there's not much effort needed.
so when you hate alcohol and burgers and cigarettes and whatnot and especially the industry that produces it cutting every corner to make more money and their advertising henchmen masking every turd with sprinkles and cinnamon, then you're no longer in the "I'm depriving myself of the thing I want", every time you think of it a flood of anger and rage splashes over you and you simply don't want none of that crap, ever.
works for me, your mileage may wary.
the other sandwich?
E2EE is explicitly prohibited by Telegram's ToS so no alternative client is implementing it. seeing as how you're already breaking it for non-important things, my suggestion is a pedal-to-the-metal approach.
then again, you don't owe me or anyone anything.
if you're already breaking ToS, include E2EE. the 17 ways your icons are colorificer and how your rounded corners are fresher interest me a total of zero.
there's dosdude1 soldering away on NAND chips; this should be a walk in the park even for a hobbyist.
as to macgyvering, the S in USB is for "serial" and such a connection needs very few wires, three if I'm not mistaken. so an absent USB connector could be fixed temporarily with clips and wires and such.
all props to the lady, her content is usually on point and she's really trying but please don't use clonezilla for cloning disk-to-disk. if you have a fairly modern OS with say encrypted btrfs, this thing copies the whole disk (instead of only the occupied space). so if you have a 500 GB disk with 50 GB used, clonezilla will copy the whole 500 gigs. aside from that not being super-efficient, it's also not very healthy for the target SSD. it also copies the UUIDs, so if you leave both disks in the system, havoc awaits.
a vastly faster and way more efficient solution is to use btrfs send | btrfs receive to copy only the data. sadly, no beginner-friendly tool for such an operation exists and you're still supposed to set up everything by hand (new partition layout, grub or systemd-boot install, fstab, etc).
eons ago, we had SuperDuper! on macOS. a free and simple tool anyone could use. that thing clones the disk by copying only the data, so it's possible to clone a larger drive to a smaller (provided the data fits), makes the target bootable, etc. so you just plug it in and it works and all of that works from a live system, no need for USB flashes and such! I'm not aware of any such tool available here and clonezilla even in "beginner mode" is a tall order for non-experienced user.
if it's made for macs specifcally, it's way more expensive; twice, at least. so while it may be usable on non-apple hardware, that's not a good value proposition.
you should look into DIY-ing it. TB4 circuitry from Aliexpress and friends is in the sub-$100 range and all you need then is a semi-decent PSU and the GPU of your choice. they are way cheaper if you can utilise M.2 interfaces, like $50ish.
keep your data turned off. you load the tablet with books or whatevers, you don't need no comms, hence nothing can leak.
second, you should get the device based on LineageOS support, so check their devices page first. there's but a handful of those, I was lucky to find a Tab S6 Lite for cheap and it's hella supported. if you have money to burn then look into Pixel tablets and such.
finally, when you eventually flash them, the battery life isn't great. even just having them lying around not doing anything in standby requires you to connect it to power every other day or so. had an iPad like 10 years prior, that thing could be left for weeks and still be available when you need it. sadly, no such thing exists here.
p.s.: not what you asked for, but take a look at old 2-in-1 tablets in the vein of Dell Latitude 5285/5290/7290 etc. those are fully featured i5/i7 machines, tons of RAM, expandable storage, you can install Linux on them with all the benefits and drawbacks that brings; battery longevity also ain't a thing here, but at least you can tweak everything (limit frequencies, hibernate, etc.)
I'm not hiding anything, I'm choosing what to share; there's a difference.
as to your (somewhat naive) perspective, yeah, having your shit out in the open is a credible threat. the solution is have all your shit private by default and not shared with anyone. then, allow leaks on a case-by-case basis.
we're all done (or should be, at least) with the idea that there are laws and regulations shielding us from the now rampant abuse from various threat actors. instead of relying on the government or whoever to enact those regulations, I find it way better to not allow anyone to be in the position to compromise me.
this is a forever moving target and you're never going to achieve full security; to paraphrase cory doctorow, that's a full-time, unpaid job that you're doing in addition to your existing job. but I'm better off with more security and privacy than without, so I'm ok with the sacrifices I have to make.