Unless something has changed, it plays fine through Steam with proton.

ProtonDB confirms: https://www.protondb.com/app/233860

I had no problems at all as recently as this year. I think I was playing over the summer

I played over two hundred hours of the steam version on Proton 8

I managed to, through Lutris, with an old cracked version. Although I had to use winetricks to install a bunch of extensions.

Played out of the box for me in steam(with proton enable) last night for me.

I did have problems with my mouse not going all the way to the right wide of the screen in Wayland though.

But the GoG version? It's rated Platinum in winehq...

I did, years ago, it worked perfectly. This was when DX9 was an option for it though, but given since then dxvk / etc. came out the DX11 renderer should not be an issue. In fact I'd be surprised if the game didn't run as-is without any tweaks.

I suggest using the gog version. appdb suggests installing vcrun2010 might be needed but again, test beforehand.