Exciting! Any way one might be able to acquire these if they aren't attending either of those cons? I should be at Bronycon, but checking just in case!
I assume Holding Out For a Hero means "break up 3 ships involving a Pony with the Villain keyword" not "break up 3 ships using a Pony with the Villain keyword", right?
Also I'd advise removing the Foal keyword from those Pony cards. While TSSSF does feature foals on some of their cards (Cutie Mark Crusaders: Matchmakers!, Suspiciously Romantic Random Picnic, etc.), they are always aged up on Pony cards as to not imply any relations involving underaged characters. While this is the main reason I advise it, there's also nothing in the set that cares about that keyword. Since I don't believe anyone else will be using it, there's not much of a reason to future proof for this either.