I tried the following guide: https://gist.github.com/NickUfer/8c7dc64cdc41b760aff512e8f458a19f. This resulted in a black screen and sudden termination after launching the game.

I found the following comment on Github which fixed those problems: https://github.com/ValveSoftware/Proton/issues/641#issuecomment-627059621. Following those winetricks instructions and editing the mentioned Engine.ini with "9" (0 initially) fixed the issue for me. There are apparently two different Engine.ini files that need to be changed with the correct DirectX version. The first guide I linked above does only mention one of them. In some cases the game might not create the second one when launching or it might have the wrong version number in it. If that is the case create a new one as described in the Github comment or change the version. Was able to play the game without problems after that fix. No black screen.