You're right, it doesn't hurt to try something new...and we won't know until we give something a try.
I'm ok with sending in secret votes (and I think the vamps inability to vote balances that out). I just wanted to raise a concern that votes are the biggest advantage (no matter how 'circumstantial' and 'biased' they might be) to ordinary villagers. Wolves (or vamps if you prefer) can hide behind their words, but not their votes too well. Perhaps I've always been dilusional and it's simply been blind luck, but with no 'gifted' knowledge the villagers use votes and discussion to help them make their decision. And essentially what's being done is part of the ordinary's advantage (as slight or little as it might be...as I think most of it is just luck) is being taken away. Therefor, there is definitely added pressure on the gifteds to stay alive and figure out information, because if they go I doubt the innocents will have any chance.
Anyway, that was my concern that I just wanted to bring out...and we won't know how things work until we try it. So, I say go for it, who knows I could be completely wrong and the vamps inability to vote might prove to be a bigger asset to the village than making everyone's vote public.