Generally, getting certifications/memberships gives you more options for honorifics, not fewer; you get to use any that are appropriate.

And for instance, if someone has a PhD and an MDiv, they can go by Reverend, Doctor, Reverend Doctor or Mx, and they’re all appropriate; it all depends on context and what you’re trying to communicate.

So Doctor Drag (he/him) is appropriate, as is Mx Drag, PhD.