To fit the 24 fret neck, you'd just have to rout a small cavity through the body to accomodate for the fretboard to sit in. However if your pickups directly touch the 22nd fret, then no, unless you completely rennovate it. However, the question you're asking, no. The guitar would be completely out of tune if you simply bolted on a 24 fret neck to a 22 fret guitar because the scale length would have to be different