I was just curious I know you can build a Khajiit around brawling using FoS. Is it possible for that to translate into the melee form of the Vampire Lord?

I dont think any bonuses from character species affect the vampire lord. They have their own stats and whatnot. I dont have dawngaurd yet.. ps3.. or id check it for ya. You can check the official wiki though.

http://www.uesp.net/wiki/Skyrim:Vampire_Lord