[wilkin250r]

No, it would be a fairly well-regulated DC-DC converter. The only thing I would need to measure is the current draw of the motor. A 5W power module is significantly cheaper than a 15W module.

Honestly, though, of all the suggestions I have seen, I think the first one I would try would be the dual FV1 valves, and not just because it was my suggestion. It really looks to be the most simple, straightfoward fix, requiring nothing more than an extra valve and some minor routing of hoses.

True, it doubles your chance of failure, but the failure rate is already very low to begin with. If the average lifespan of a valve is 20 years, now you're theoretically at 10 years. I can live with that kind of risk.