I'm sorry I missed your question before. It's Chai's fault. I don't have an answer but I think it's a worthy if not altogether viable combination. At first thought, you might think PD and RP are a perfect pair, but I'm not sure. The times I tried it, our groups had different ideas of what RP meant. Also, rerolling a character might not be much fun in RP. Say the group has progressed to level six or so...what do they do? Everyone reroll?
I'd say, send a private message to Lessah and ask her. She's into RP and PD. She may have a better answer. If you find what you're looking for, let us know how it works out.