Yes, there is a lot of misinformation here.
Every reputable doctoral program in the humanities provides student funding, in the form of a tuition wavier and health insurance for the duration of the program, and a living stipend for at least 2 to 3 years. True, most programs require doctoral students to teach. However, teaching is not merely a way for humanities graduate students to earn money for living expenses. It an integral part of professional development in the humanities, because nearly all academics in the humanities regularly devote time to classroom teaching, even at the highest-ranked research institutions.
MD/PhDs in the humanities frequently conduct research on the ethical, social, and legal aspects of clinical medicine and emerging technologies. Entire journals are devoted to publications in these areas. NEJM and JAMA also frequently publish on these topics.
OP, in addition to the great combined MD/PhD programs mentioned above, you might also want to consider medical schools that offer combined MD/MA programs in bioethics. Case Western Reserve, Pittsburgh, and Northwestern come to mind. Doing the MA first may help clarify for you whether you want and need to pursue the PhD.
I did a humanities PhD first. Thrilled to be heading to medical school next year. Please PM me if you'd like to talk more.