After seeing this post i decided to give it a try and ordered a v2 Vamo replacement head from ecigaretteimpressions.com (they were friggin awesomely fast btw) for $10 shipped. Like your post I liked the flat top of v2 rather than the tapered of the v5.
I received the part in 2 days (damn fast), but I didn't have time to try it until today. The hardest part for me was the soldering since I literally haven't soldered anything in like 15 years, but I was able to get the wires to stick without resorting to superglue. LOL Put it back together and I now have a working Vamo with a flush mountable head. WOOHOO!