Paul105, you might try your 9mm and .38 Super uppers on the Ruger, they may function just fine. Both my Colt Combat Commander and later Ruger CMD .45's will function and fire just fine with Colt Series 70 vintage Combat Commander slides/barrels in .38 Super and 9mm.
I bought them both off Shotgun News 30+ years ago with the conversion in mind. It's been a long time now, but IIRC, I had to change out the ejector only, to get them to function. When switching back to .45, I leave the 9mm/Super ejector in place with no problems. After buying the Ruger CMD in .45, I found that it too would run with any of the slides/barrels. Both guns, I found were most accurate with the Super/slide barrel in place. Too, I've got a Marvel 5" and Ciener 4-1/4" slide/barrel in .22LR that work well in them.
Best Regards, Rod