I don't think I could improve on the moon clip. It's really fast and easy to use, and with a BMT mooner, easy to load and unload. All revolvers should be built for them.
Anyway I've never been a great fan of speed loaders my new revolver is cut for moon clips and I ordered some made out of polymer, doesn't require any tools to load or unload them. We will see how they work out. Other then that I've always just carried speed strips, easy to carry and convenient.