Hi - I was vegan but am trying AIP.
I've only been AIP for 11 days now in but have accepted that to get enough protein in my diet (which came mainly from beans, legumes, and lentils for me) then I was going to have to include some fish and meat. I'm still incorporating days where I don't eat meat, but find myself to be very hungry due to the lack of protein.
Once I've learned about any food triggers, I hope to reintroduce some veggie proteins and reduce or eliminate meat again. Seeing it as a temporary thing while I learn about how to manage my HS.
Not sure about how it would work if you're vegan for medical reasons though. Maybe a nutritionist could shed more light on how/if you can manage both!