That new Yakuza game came out and I was looking into hooking up a speed up button for desktop and my deck, and decided to update the Proton Speedhack compatability tool I made to the latest version of proton.
Can find this tool here: https://github.com/LtSquigs/Proton-SpeedHack/releases/tag/proton-speedhack-8.0-5
Note: This tool is more or less just for the Steam Deck, if you want a speed up button on Windows, you can hook up Cheat Engine to do this (and using Steam Input even hook up a controller button to activate/deactivate it). Maybe ill write a post about that later lol.