What do you mean? You use the 5lb tank via the Aarke instead of the CO2 cylinders? Or you refill somehow the CO2 cylinders? If it's the first one this sounds like the best of both worlds with the convenience of the countertop device and the cost-efficiency of the bulk CO2. It would be great if you elaborated some more!
I bought a hose from Amazon where one end screws onto the 5 kg CO2 tanks (I'm in Japan so metric) and the other end has the same male nozzle as a SodaStream cylinder so you screw it in where a cylinder would screw in, so the tank feeds straight into it. Just need a place on the floor near your countertop to put the big tank.