Converting Newcastle Draughtkeg to use CO2 tank and party tap
 

I have a spare 5# CO2 tank and I was thinking it might be nice to put it in my fridge with a little 15L keg. I know they have those little taps that can take the little pellet gun style CO2 cartridges but that's pretty irritating. Is there a kit out there to use to convert to something usable?