Just a thought, and maybe a little wacky to some, but instead of routing the cavity, maybe a shim in the neck pocket would give you a little more room above he neck pickup that you would like. You would have to raise the bridge saddles to compensate a bit. I got a little more room over my Jag pickup when I shimmed my neck. I used a .5 degree shim from Stew Mac.
The shims are fairly inexpensive.
https://www.stewmac.com/tonewoods/sh...ign=2021-05-gp