Hmmm, you don't want it but here's my advice. Keep builds for PvP and RP separate. Otherwise you look like a trammie who doesn't feel like forking out the cash for Fel PKing. I don't know much about UO but thats something I do feel.
RP is about building a character, your character might be a vampire who was a paladin in his past life, hates what he's become and now fights for 'good' and does it well. But at the end of the day if I was playing a character who had mixed abilities that only a RPer could play and enjoy the hassle and saw you in battle, I'd be peeved.
Nothing I can say after 2 months of playing that has credibility but if I wanted a PKer I'd have a PKer slot ready. Instead I have multiple characters that while I play I refine their backstory, on the other hand I was considering a Role-Playing Pugilist known as Ulfheddin who's whole intent was to max out wrestling and challenge RPers to a fight to prove what a hardcase he was. So the point of my rambling is that I keep the 2 separate and after supping 7 Boddies, there ain't no sense
