1. In this case Southpa you are wrong, he can still do a bolt on, just not traditional style. The Saga HT-10 and some PRS (CE if I'm not wrong) are bolt on necks and have the same area you have on yours, 2 screws on the top and 2 under the pup area
2. I will do the recess into the body before the angle anyday, but since you have already a carve, you can modify it a bit to make the angle into the body carving rather than the neck.
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Do you have an example? I like the idea of having a bolt on better than the set because, I can modify the angles and play with it to get the best tone and feel.