You could use a different homeserver like tuwunel (a conduit fork), which is wayy easier to setup than the official one.

Interesting, the Cloudflare CAPTCHA works for me, but I’m on the Fairphone 5. I haven’t tried supertuxcart but minecraft (java) works pretty well. Youtube works for me too, but that might be because of missing hardware acceleration drivers on your phone.

I wouldn’t call PostmarketOS that niche. It’s a phone distro, but also runs on SBCs and allows installing the non mobile version of DEs