Try booting from an usb (with a live linux image) stick and see if you can access your drive.

You might need to switch to a smaller instance.

If you want a kali-based live environment, you can follow this tutorial: https://www.kali.org/docs/development/live-build-a-custom-kali-iso/ You can configure a lot of options and most of the building process is just downloading packages.

That might be problem with cloudflare or some other DDOS blocker used by lemmy.world that requires javascript and cookies.

Seems to problem with lemmy.world. I just tried Orbot with jerbora and lemmy.world and I got what you described. On my new account on lemmy.today, it works without any problems. (In fact, I just posted this comment via tor)

Many ARM boards (including raspberry pis) are designed to run with linux. So the manufacturers can customize the kernel and firmware for the boards.

In theory, you could make a XMPP bot that can do all these things. Status information and executing simple commands shouldn’t be that hard but interactive commands might need a custom wrapper.