45644, your idea has some merit, the Coonan mag is the one I would go for, it is the ejecting of spent versus live round in a revolver, it is quite the trick to eject the spents, without the live rounds, it can be done, but you need to practice often, it is easier with the short revolvers, as they have only a 2" to 2 1/2" ejector, which will only raise the rounds but not completely eject them, so you could pick the spents out by hand, and use the mag to load the empty cylinders. Thumbing them off the mag, into the cylinder. Under stress, I would prefer emptying the cylinder completely, and reloading the full 5 or 6. I use safariland comp 1 as speed loaders, very rugged and dependable. Harder to hide, but reliable. Speedstrips work well too, but take practice, again as I have mentioned.
Good luck.