If you want portability with bass, I’d reccomend trying over-the-ear heaphones. I have a pair of Sennheiser HD 250’s and they’re excellent. No feedback from the aid, ample bass response, and they’re open enough that I can hear someone talking to me when I have them on.
Now I have no idea if this style is bad for the aid or anything, but my audiologist didn’t seem to think it would be an issue. Obviously the whole “listen to it at acceptable volume” argument applies