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Thanks for stepping up.
It looks like one of those good news / bad news situations.
The good news is that there is enough room to drill the new mounting holes for the original Mini-P bridge to be moved one inch [25.4mm] further away from the neck.
The bad news is that there would be insufficient wood beyond the bridge to do so safely and securely.
Also, as we approach the edge of the body, the flat surface begins to curve/taper, which means that the bridge might not sit flat on it at the new location.
So putting a 30" 19 fret neck such as from a Mustang or a Squier Bronco [onto a Squier Mini-P body] might indeed work at the neck pocket, but the main trouble would be at the [ confounded

] bridge.
BTW, the reasons to even TRY this Franken-Fender experiment [and the benefits/results from doing so] are :
1) Maple fretboard [if Bronco and some Mustang necks],
2) 30" scale fits regular short scale strings better than a stock Mini-P does,
3) Nut width is 1.6" [if Bronco neck], and various widths [if Mustang neck],
4) Lighter Mini-P body weight [compared to a Mustang],
5) Split-style hum-cancelling pickup [compared to a Bronco].
But the bridge would most likely be too Close to the Edge - Yes - unfortunately.
Knowing this now, if it was ME trying the mod, I would likely do this :
1) Move the original Mini-P bridge only 1/2" to 5/8" South, not a full inch,
2) Remove the springs from the E and maybe A string intonation bolts, to get a bit more adjustment range,
3) Pray.
One additional strategy might be to investigate whether an alternate bridge might mount better, that far back.
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