You can certainly add vampire abilities to a stam toon. The Scion, drain, frenzy, mist, and hypnosis can all be integrated. The only ability that would not work as well would be eviscerate, seeing as it deals magic damage.

With the Scion, and perfect Scion morph, you still deal physical damage, and with frenzy, you are gaining weapon as well as spell damage at the cost of health. Using drain, you have the option of more ultimate regen, or extra stamina sustain. With mesmerize, costing magicka would be better for sustain as you are spending magicka and not your primary resource, and mist is a good "oh ***" option for some situations.

So go for it! Try everything and find what suits you best.