Are the subtitles in individual files per language in the game directory? If so, swapping the filenames for English and German while keeping the spoken language as German might work. Not at the PC so I don’t know if I have the sequel to test the theory; will check later.

Does that controller work with one of 8bitdo’s wireless dongles? They’re pretty cheap - I paid around £8 for mine a few years back - but it will need a USB-A port free. Might be a stopgap so you can decide if something else better suits your needs.