Between Fred Clark and Leon Glicenstein/Hoosiers intergeneric crosses, I don't think it's too far from plausible. Not that all or many of them are improvements on either comprising parent, but it is sort of fun to see what happens.
50% or higher is enough for both species. My plants are outside during the warmer months and the outdoor humidity can be lower but not often. You should not have much of problem with 50% humidity since you are in FL.