You can theoretically run the other program with Proton as well. Just if that helps get your other software up and running. =)

Quoth the raven “Never more” (will that Ethernet port work)

This is typically done through what are called “forced subtitles”. I’m not sure if you have any specific question like how to enable forced subtitles, or how to get forced subtitles. But hopefully if nothing else having the keyword helps.