My guess is that since S-1-equipped (US-made) guitars are much more expensive that regular (Mexican) Strats, probably Fender will make sure you cannot buy a $9.99 switch (or whatever it costs) and double the value of your Mex (?) ax :).
But I wonder if a Jimmy Page - type push-pull volume pot can work for you. Guitar Electronics has this kind of kits (and my guitar tech can order an original kit from Gibson for my LP, which I am planning to do later this year).

Bottom line: talk to a KNOWLEDGABLE guitar tech if a Jimmy Page - type push-pull volume pot can be installed in a Strat.

And please let us all know if you find a fix!