I got Finals working on an i3 nvidia system basically by doing nothing more than installing Steam and then installing The Finals and playing through proton. What issues did you run into?
According to the game's Steam store page, it uses Easy Anti-Cheat, which generally does not work in Proton. Pretty common problem for people who want to play modern online games. I'm surprised you say it works for you.
EAC has an option for Linux/Proton support, but it has to be explicitly enabled by the developer. I believe it ships a Linux binary that runs alongside the game, poking into the wine environment. EAC works just fine in proton with Halo Infinite, for example.