Honestly, I think Feb/Meb is the easiest to stick with, and I'm not even a radfem nor a feminist(though I can agree with some of the things they say).

EDIT: Though cinnaflo has some easy acronyms to remember since it already existed before. W4W, M4M but adding "Bi" infront.(BiW4W, BiM4M).

But I would rather say "I'm a bisexual women who prefers women/men" or whoever I was strongly for at the time. I don't really use anything fancy.

...Making more labels might just become more confusing/complicated than needed to be.