I carried only a j frame for well over 40 years. As I've gotten older (70) small & light are important for a variety of reasons so now my EDC is the LCP w/a spare mag. During my 30 year LEO career I had to use my .38 more than once and do not believe carrying weapons with different operating systems is wise, at least not for me. When and if the moment of truth comes you will need to react instantly, w/o thinking. If your carrying a semi auto one day, and a revolver on another, things could go wrong. Please don't misunderstand. I do not mean to disrespect others or tell anyone what to do but I would not feel comfortable rotating weapons. Just my opinion which is free here so you can judge for yourself what it's worth.

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Old Cop
LEO (Ret.)