I really don’t feel limited when I play on my 21 frets strats.
As the matter of fact, I have a Hendrix one like, which is a left handed guitar turned all the way. That makes upper fret access really hard, and it is the reason Jimi hardly ever plays in that register. So Hendrix played something like a 19-20 fretted guitar all his career.
Now tell me that Jimi’s playing was limited. Obviously it was not.
What I’m trying to say is that you only have to change a little bit your perspective and take your new instrument for what it is. A strat is not a Jem, and a 4 string bass is not a 6 string bass, but you have endless things that you can play either with 21 frets or 4 strings.
Having said that, I might be interested in buying your neck if it is the all mapple version and the price is good. That way you can get some cash for the Warmoth scalloped 24 frets. PM if interested.