May want to track that "high loop" to make sure there's not an anti siphon valve at the high point in the loop. Mine has the valve hidden up behind the bathroom sink. IMHO that's a few wasted feet of pipe I'd leave as you found it.
If I were get real energetic to do what you're doing, my 1st step would be to build a water manifold for hot/cold so I could quickly shut either hot/cold off to every fixture individually from 1 handy location, which would most likely require more tubing.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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