I saw some budget Korean flying Vs & explorers at Dan Music in Peninsula - why not just get one & sell of yr flying V body...those Vs have glue on necks & gold hardwear with jumbo frets if I'm not mistaken and are quite cheap at $350 or something like dat
Set necks can be replaced, its just more work and more expensive. But if you want a Gibson Flying V neck you need to get it from a Gibson Flying V. If you are looking to repair a Gibson Flying V you can ask Gibson in the US if they can put a new neck for you.