Well I can finally let out that breath I've been holding in for the last... month. The Boise City Plumbing Code inspector signed off on our total-gut-and-replumb of our supply pipes this afternoon, after a surprisingly brief inspection. My custom recirculating hot water pump configuration didn't even phase him.
So, now I can finally sleep at night without the nightmares of the inspector shaking his head sadly and telling us it all has to come out again. Phew! Good job Certified Amateur Plumber Lemontree!!