I'd try for fixing the pocket if the neck angle needed to be increased, as it's (relatively) easy to sand the headstock end of the pocket down a bit and keep the floor of the pocket level.

But there's no particularly easy way (that I can think of) to sand the body end of the pocket down as evenly without almost certainly creating some unevenness. An experienced woodworker might be able to chisel the wood out, and those with good routing skills might be able to make up a suitable jig, but for the majority of kit builders, altering the neck heel is the easiest way to decrease the neck angle (apart from a shim at the headstock end of the neck heel).

Good work on your neck heel. All looking great now.