I’ve been using Fennec and it works 99% of the times and on the rare occasion I need Chromium based browser I use Brave. I don’t have any issues with either.

Wow! This sounds really interesting. I am definitely intrigued by your idea. If this was an existing game today I would for sure give it a chance.

Oh! true, completely slipped my mind. Install it in another PC or use an M.2 enclosure with USB C to partition it and clone the original.

I don’t own a Steamdeck myself but since it’s Arch Linux based there should be a partitioning tool like GParted built in.

You may want to check if it is partitioned.