Being able to mod Dawnguard is the main reason I am also buying this for PC in 29 days. I don't have any mod-making experience but somehow, being created by myself or another, I would like the Vampire Lord's model to be replaced with Harkon's VL model. That looks amazing.

I think that shouldn't be any trouble at all... Great idea, though. You should post it on Skyrim Nexus

Well , they will mod the hell out of it , which is amazing of course !