I actually like how it is right now. It makes it obvious you're on your alternative account.

Easiest way is to enable Restore on AC/Power Loss if your bios has that feature and use a wifi plug to do a power cycle whenever you want to start it. I believe this would also works even if the computer is powered off.

What type of CPU cooling are you using? Have you checked the connection to the CPU fan?

All of the instances I looked at have option to block all nsfw contents within your profile settings. I think you can also block specific community/user . But i don't know if there's an option to block a whole instance.