@thewandererreturns: Thanks a lot!
Apparently it works with Basel St. Johann, but I haven't found the same offer for Basel SBB (while the former is not a direct connection and the latter is
). Also, I did indeed write them asking about this stuff, so let's see what they'll answer.
@Medea Fleecestealer: I'm a EU citizen, so I think I shouldn't have any issues relocating in France. This is probably another issue to figure out, but honestly right now I'm more concerned with the transport. If that fails, everything else fails.
@Ace1: Mulhouse could be an option but so could any other town or city (I don't have a fixed plan yet). Right now I just wanna check this option in general and I'm pretty uncertain about the whole plan. The only thing I know is that I visited Basel and didn't feel at ease there.