I appreciate and agree with your point about medical monopolism, and in general around the principle of medical self-determination. So, let me frame this another way:
If you're trained and knowledgeable enough that you're legitimately on-par with, and equivalently equipped to, a professional working in the field, but the thing you're doing is something that would be dangerous for someone less knowledgeable/equipped than you, there is a risk in publicly describing the activity as DIY.
We do regularly get people with negligible background in biomedicine and none of the requisite equipment rolling in and asking for advice on doing advanced cell-culture medical procedures, or help with making a bioluminescent tattoo, or what have you.
Years back there was an effort to help draw a chalk-line around what we as a community will consider "DIYbio" so that the hobby does not earn a bad reputation (even the entirely safe and predictable stuff gets tiresomely bad press from time to time). Medical procedures fall well outside that, IMHO.
Or, TL;DR: If you're going to help democratise medicine in a safe and responsible way after undertaking years of medical study, that's cool, but calling it DIY draws undue scrutiny on DIYbio.