My new favorite CO2 tool incorporates my other favorite for tubeless tires - Dynaplug. With this inflator, you can plug the tire and inflate it in one motion. Genius. It's also controllable in metering out the CO2. I don't think saving some of the CO2 is all that practical for more than about a half hour or so, but the ability to control it's inrush into the tube is a great deal though.
Dynaplug® Online Store | Dynaplug® Air Tubeless Bicycle Tire Repair Kit
