Sorry, I misunderstood, I thought your outdoor hose bibs were the ones leaking.
I'd simply replace the two faulty valves with new ones with bleeders. Putting one in between the tee and the two valves wouldn't hurt, but isn't really needed, it's more a convenience factor like you said for servicing the valves without shutting down the whole home and only draining down one line instead of two come winter time. The plumber was nice and ran two separate lines to the exterior, where typical it would be one then tees somewhere outside the mechanical room!
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