Logically, the distance between the bridge and the neck needs to be reduced. Either that, or use a different scale neck with that body, or vice versa. Or the guitar will never intonate properly. That's what I'm seeing.
Can it be done with that body? In theory, I suppose. But if you cut the neck pocket deeper, would there be some negative repercussion that you're not aware of? You'd be removing wood between the pocket and the neck PU rout, making it thinner in that area. I have no idea if that would be ok.
Or, can the trem posts be drilled a little closer to the bridge PU cavity? Again, how close is too close?
A combination of both adjustments?
I'm sure Andy will know what to do...
Even if you had a router, you'd need a jig to control it. The jig would need to exact radius to maintain the correct curve that the end of the neck has. Not an easy thing to do, to modify that body.You're right. I would lose contact surface between body and neck. I don't know what impact that can have.
I could do a combination of reducing both neck and body. I could file the neck with patience, but the problem is that I do not have a router, and reducing that wall at the body would be very difficult to do without one.
How did you determine that that body and neck were compatible with each other?
It actually looks OK use the diagram I linked and see where it puts the studs. I would guess pretty much in the expected spot.