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I don't see a problem with carrying different platforms as long as you are proficient enough with all of them that you won't mess up the manual of arms in an emergency. For example, if you've been practicing with your 1911 and P238 and and try to swipe off the safety on your Glock, it's not an issue. However, if you've been practicing with your G33 and forget to disengage the safety on one of your other guns, it could be a problem.

That's the reason I only carry guns with the same firing procedure. The only two guns I carry are a Glock 19 and a S&W 642. Very different guns, but same procedure--point and shoot, no safety to worry about. If I were you, I'd switch to SAO guns only--that covers your 1911, P238, and the Solo when it arrives.