In this case as in most of its kind, I find the framing constraints too absurd to consider. "Vampire turns my five-year-old daughter," or even, "the Man in the Moon climbs down my chimney and tries to sell me a used time machine," sure.

"Know all the conditions in advance so I can decide on them, and know also I can't ever find out more?"

The me who is capable of having even that one belief, is not capable of being me. The asker is licked before he starts. Though since there exist people who can believe such things, I guess it isn't an idle question, either.