The good news is that at least the rebuilt dependencies seem to work (initially) for you
In my fork, I try to replace BASS by SDL_Mixer (because that one is royalty free). But it probably still has bugs (at least one I'd say).
Can you manually change the iOS project to remove the "USE_SDL_MIXER" define, replace the 2 relevant files from the "SDL_mixer" subdir with the regular ones, and add the BASS libraries? Then you should be back to BASS. (You might also try to simply use the main repo with my dependencies plus BASS, this might also work.)
I haven't seen the crash, because I only use the functions with a channel (e.g. PlayMusicChannel() and so on). If you don't mind, would you send me a project where the error occurs (unless it's the same one that you want to build for Android...)? Will probably take a while until I can have a look though.