The answer to your question is quite simple. There is no 'vampire' spell that will ever be effective. About the only thing you can change is your mindset to becoming said 'vampire.' That would be my answer without voicing my opinion on this matter thoroughly.
because to put it simpley...you would need ALOT of energy to do it (if it were posible) because you have to phyicaly reshape something, and theres no promise that it will turn out right even, and society will shun you also if you achieve it becuase people are bastards to change/diffrence