Thanks for putting this up! In particular I am very happy to have a chance to re-experience Knot-Pharmacard Subcondition J which I think must have been the first Brough game I ever tried, long long ago. I'm also enjoying discovering other hidden gems in this huge collection. So far, Reverse Passage has made me actually LOL.
In regards to Linux compatibility, I've had good luck so far getting these to run on my Steam Deck using GE-Proton10-25 which is the latest stable version of Proton GE at this time of writing.
I've found the easiest way to download and install Proton GE is using ProtonUp-Qt which you can use in desktop mode to install. You need to restart Steam to get it to detect the new version of Proton GE.