It is an older Thread but if anyone has the same Question I have tried the Steam Version on Linux FHM 5 for example works on Steam Play with Proton 4.11-2.
You probably won't get support, but as far as I can tell you can run the game and play it.
By the way I would prefer a native Linux version, too. I also play OOTP XX and there you get a native Linux version. Both games look very similar to me, I do not know how they differentiate under the hood, but though it should not be a big problem to release a Linux verion, or am I wrong???
