This was my (Very) non-optimized solution that I sent in, although looking at it, I wasn't very awake when I ran the attempt... I completely left out Young Witch! X.x - Well, I embargo'd Province twice, which would've counted the Bane, so it still works.
But, as I said, I imagine it could be brought down to 10 without too much effort, if I focused more on buy order, and slipped Worker's Village (or Hamlet) in for +Buy
Also, I'll post up the results to the Governor's Ball a bit later, but I'm thinking for my next challenge I'm going to leave it open-ended: That is, everyone can feel free to post results straight to the thread, no deadline. I'll keep an updated list in the first post of best results. I think I'm going to stick to predefined boards (my first one was... but it wasn't required to use it) though, and see if I get more results.