Not an answer to your question but a question from me. Are the valves unscrewing because you are using a screw-on chuck? If so, why not just get a pump with a locking chuck instead or change the chuck out in favor of a Silca chuck? Good locking chucks last a long time and unlocking them to insert and remove means the gaskets last along time. Granted, not all locking pumps are good. The Zephal bike mounted ones are as is the floor Specialized. They have worked so well for me I haven't ventured further. I did spend 15 years screwing and unscrewing a high quality Italian floor pump. Finally got tired of wasting so much time doing something that took less than a second on bike pumps. (And yes, I unscrewed a few valves with that pump.)
Ben