We recently turned into vampires and just hit lv 7. I am was trying to build a character using the strangler archetype from the brawler with the race of Human Shoati, but it's too new and I couldn't get the stats for it. I tried winging, but I hit a brick wall since I can't take final embrace because I don't have a constrict special attack.
Traits: Bred for War and serpentine squeeze
Feats: Improved Grapple, Improved Unarmed Strike, Turtle Style, Snapping Turtle Clutch, Power Attack, and Greater Grapple
Damage without power attack: +26/+21 1d4+13+2d6 and then a save to negate negative levels.
I am wearing a Mythril Chain Shirt so my ac is 28
My saves are 9, 13, 3
My magic items are Belt of Physical Might +2 Str +2 Dex and Gauntlet of the Skilled Manuever
Look into getting an Anaconda's Coils Belt.
It gives you the Constrict ability, doing 1D6+STR for damages.
Put armor spikes on your armor, it's free damage with every successful Grapple check.
Get the Rapid Grappler and Throat Slicer feats.
PS. I agree, getting turned into Vampires is TPK... But it's not my table, so have fun with it.