I suspect I'm not fully addressing the specific question, but a general response:
The reason a different scale neck has a tricky time working is that there's a third factor. If it was just the nut and bridge, you could theoretically put any neck on any body. But you can't. Why? The third factor is the neck pocket.
Because the neck pocket creates a constant and unchangeable distance from the bridge to the 'end' of the fretboard, changing scales means that something has to give. The nut's not going anywhere, which means you MUST modify either the pocket or the bridge location.
An example to illustrate:
You have a 25.5" scale guitar, with 22 frets. Let's say the end of your neck is where fret 23 is in "theory" but of course there's no actual fret there. After calculating, you discover that the end of the neck is exactly 6.75" away from the bridge (well, the high E saddle of the bridge).
You want to switch to 24.75" instead, and you figure, "Hey, this should work. After all, it's only the distance from the nut to the bridge that's changing." HOWEVER, you haven't modified the neck pocket or moved the bridge. That means that from the end of the neck to the bridge, you STILL have 6.75", right? Trouble is, when you calculate a 24.75" scale, the end of the neck WANTS to be 6.55" away from the bridge, instead.
0.2" (a fifth of an inch!) is a lot, when it comes to intonation. A whole lot. Most guitars won't let you adjust the bridge that much forward in the first place. If you were lucky enough to squeak it in (I highly doubt it), you would screw up your trem's action, or might end up bumping into your bridge pickup.
I just don't see any way it would be possible.
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Now, going in reverse and not bothering to do the math: if you go for a longer scale length instead, your bridge wants to be FURTHER away from the neck pocket. Most of us already back up that low E string almost as much as it will go when intonating.
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OK, so that's why a body DOES have a scale. I'm sure there are some ways to work around this, though. If you calculated all 3 of the factors and custom-made a neck, you could find a way to work around it. It's just math, after all. Seems like a lot of work, though, and probably for an unsatisfactory end result.
Greg