Is there a neck i can get from warmoth, or elsewhere, that fits a strat body's neck pocket, but is short scale like a jaguar?
maybe. youd need someone who knows what they are doing when it comes to custom things, not warmoth.
Warmoths site has all this info posted. Their necks are mad to fit in strats or teles depending on which you order. And they have various scales. Unless they have what you want in stock then expect to wait about 6 weeks to get it.
Sounds like you would have trouble finding a company that made them like that, I could make you one if you were interested.
It took all of 10 seconds to go from google to the warmoth page with the 22 fret 24"scale mustang/jaguar neck with the strat neck heel. Maple maple neck is 157$ maple and rosewood is also 157$ if you add custom stuff the cost goes up.