You could try a cock ring. Doesn’t need to be fancy, and use a flexible one, not rigid.
Am a cis gay male who is a natural bottom, but a cock ring enables me to stay hard while topping. Sorry to intrude, I enjoy learning the perspectives of all the trans communities on Lemmy ☺️
Even in non-surgical settings, operating room ergonomics is a huge area of research right now. Even in a routine colonoscopy there are often a half dozen workers attending to the patient, and making sure they can all reach at a comfortable angle and height, without twisting their neck to read a display, is a big challenge.