We'll never deal with any pressures that make that a risk. That is good advice about not bumping the plumbing. An unmolested bulkhead is a happy bulkhead.
The PVC gate valves with the big wheel you turn...all plastic so no worries. They're just silly expensive.
I'd make the second 1.5" hole an emergency drain in case the first gets plugged. Then you can do a herbie setup. I'd just run my return up and over the top no need to tie up that precious hole when you only have 2.
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