Re: How do you build a vampire template in 6E?
Not if you expect consistency. The baseline character (pre-change) will be augmented and given several new disadvantages. There is no reasonable/explainable way to "heal" a vampire. According to all source material I've ever seen concerning mythic vampirism, regardless of regional consideration, the only way to fix a vampire, once changed, is to kill them.
Within a fantasy milieu, you have wish spells.
Within modern or super-heroic milieus you have a stake in the heart and decapitation, or fire.