is their a way to "cure" syndromes that a dwarf(or other enity here) is afflicted by namely were and vampire syndromes via adding some sort of anti-syndrome syndrome or equiv to the raws?
You /might/ be able to kinda cure lycanthropy in a roundabout way if werewolves work like I think they do. If you're transformed, you're immune to all further transformations. Any transformation syndromes gained after that are queued behind the current one and will only activate once the first wears off.
For example, my Pokemon evolution syndrome works by telling the game I want a creature to wait, let's say, one year and then turn into its second form lasting one year. I input for it to turn into its third form only five tics after turning into its second form in the same syndrome, but since it's immune to further transformations until the first wears off it will stay its second form for the full year and then immediately turn into the next stage.
So if you permanently transform a dwarf afflicted with lycanthropy into a dwarf, it will be immune to transforming into a werewolf because the werewolf transformation is queued to happen after the dwarf transformation wears off - which will be never. I'm not sure you can change creatures into themselves, but if you make a few redundant castes for each gender that you can tell between (a small difference in the description text, maybe) you can transform them into the correct gendered caste they aren't.
You could try a workshop reaction and a boiling stone for different races and genders. Just keep in mind that though they'll have the same mental attributes they'll get totally different physical attributes when they transform.
That's my ten cents. Anyone correct me if I'm wrong.