Anything that runs Android should run KoReader too - which IMO is still the best way to consume Wallabag content.
I have recently purchased a BOOX tablet with Android 14 and it works great with KoReader. But even my old Mobiscribe 1st gen with Android 7 was doing its job - it was too old for most of the recent Android apps, but KoReader works fine even on ancient Android versions.
You can find a good Searxng instance or run your own (it can also run on a RPi)