I shall tell you what I did today. I have been suffering a bit of fatigue in the neck and shoulders and have been wondering about a short scale guitar.
So I tried this trick out.
I lowered the tuning on my guitar viz. DGCFAD and put a capo on the second fret. This effectively shortened the playing scale.
I have to say that I felt more relaxed and stretching was more comfortable. I also moved my solitary white dot from the 7th to the 9th fret to keep the 'feel' the same.
The only problem is playing stuff that goes beyond the 12th fret, but I don't have too many of those pieces.
I recommend anyone who is suffering neck and shoulder pains, particularly the left, when fretting with left hand of course, to try this out and see if some relief is experienced.
All the good music has already been written by people with wigs and stuff.