I've seen a lot of suggestions for Strat-dimension necks, but I've played Guild and Ibanez for ever (currently an SE)…I think a good compromise would be a 3/4 size neck with very minor adjustment to "fret" spacing, primarily at the high end.
I was very impressed with the fingerboard on the 1960's Guild M-65 Freshman and think it would be ideal for the purpose.
IMHO a 3/4 size neck would not help in this respect.
I am quite sure that the 'length' of most guitar necks is the same - take your YRG and place it on your Guild or Ibanez so that the 12th frets align. You will see the same effect as with a Strat neck. It is the same effect at least with my acoustic guitars (Martin and Taylor).
Above the 12th fret it is a different story when it comes to the number of frets. BUT the spacing is always more or less the same. You stated the reason for this in your post: It would interfere with your music in a major way any time you changed the guitar...
My suggestion is not to ask to change the shape or width of the fingerboard. Because when you touch this aspect of the YRG, the whole neck has to be redesigned, i.e. a new (plastic mold) tool set for the production would be required. It would make a standard neck (= with standard fret spacing) extremely expensive!
A standard neck will 'only' require a redesigned fingerboard surface (which probably is pretty costly already), the neck itself incl. the connectors can be kept.
It would be really interesting to hear something from Inspired Instruments.