The Libreboot site lists supported hardware. You need a bios programming chip (cheap on Amazon). Freeing your bios is a dorky thing but valuable to learn. Here's a vid that'll give you a sense for it (Mental Outlaw is great) - https://www.youtube.com/watch?v=WyItt8FJWIs
I prefer LibreWolf to Brave; no commercialization or shitcoins, just stripped and hardenered Firefox.
I ran a comparison test a few months ago and saw that both LibreWolf on Linux and Bromite on Android ourperformed Brave in terms of privacy/safety. Forgot which site I used.
Linux Mint is a solid option based on Deb/Ubuntu; for your daily driver I wouldn't change. Pop and Zorin are also great daily driving OSes.
For your dedicated Bitcoin machine I do recommend something slimmer like Zorin Lite.
