Awesome work dmtaylor! Thanks for the info, I might just need to give this a try.
There's got to be a way to get a regular CO2 tank to push through a presta valve. I know there are lots of DIY's out there for making your own carbonator cap and they use a presta valve pressed through the cap of a standard 2 liter soda bottle.
I would assume the guys that make their own carbonator caps to save $10 don't then go out and drop coin on a CO2 charger and the disposable CO2 cartridges. That seems a bit contradictory.
I've got the exact same CO2 dispenser dmtaylor uses. This puppy has a flare fitting on it just like the ones on the quick disconnects/CO2+beverage lines for your corny keg. My guess would be that all you gotta do is screw it on.