Finding short guitars is easy. My kid needs a narrower neck too. Even her Hello Kitty Strat is too big.
A McCarty or Custom 24 that is 80% of original size (20" scale) would be just the ticket. John Mann said he could machine a proper trem bridge to match the size.
I'm going to email Seymour Duncan. If they have a way to make a set of buckers at 80%, I'm inclined to get a PS quote.