Oh.
I did not though of epic fighter feats. I'm starting to see the problem of the ACF.
Still, I believe that RAI (or even RAW) is that a monk can take any fighter bonus feat.
However, I still believe not letting monks take too powerful feats (if those feats are too powerful indeed, and not just making the monk a bit better) might be a better way to fix the ACF than limiting its feat selection to the PHB, but your interpretation has the merit of not being dm-dependent.