The reason why IPL won't work on the face is that it just doesn't have enough power to kill the follicles. For AMAB people hair follicles in the face are deeply rooted and strong in a way that is not the case in other parts of the body
Laser and IPL both cause permanent hair loss but just note you have a lot of hair in different cycles so this takes a while.ipl is much lower power so you're also not going to kill as many but you will definitely thin the hair out significantly. Like my leg hair takes a while to grow back and I only shave like every once in a while now. For body IPL should suffice though.. imo.
Laser yeah I think it's pretty permanent but it's not going to get everything. You'll have to finish up with electrolysis. Unfortunately this whole thing is a multi year process though you'll start seeing results somewhat quickly.
Re:covid I think you'll easily be able to request they wear a mask. They should also be sanitizing the decises like between customers. What other actions do you want them to do to be covid safe?
I need to just get a strong internal sense of gender. It's kinda hard when no one sees me :/