Craftbrewer ones aren't designed for refilling, just an adaptor
The only options i've found are:
1. Get two type 60 adaptors from BOC, a 1/4 NPT bushing (female at both ends) and a sodastream adaptor that connects a sodastream bottle to your reg, which you probably already have. This will be $120 for the two type 60's, $4 for the 1/4" NPt bushing, and $30 for the sodastream adaptor. $154 dollars. So pricey.
2. Contact a paintball place that should have a refilling station for paintball CO2 cylinders, pretty sure they use the same thread as a sodastream. These vary a lot, but i think somewhere around $100-150 is a good estimate. So pricey again.
3. Find a fitter and turner that can make a bushing (female at both ends) where the female thread matches the male thread on your gas bottle and sodastream adaptor (which should be the same). I found a guy who said he could do this in the ACT, but never got around to it. I'm guessing this would be the cheapest option.
Its really hard to find anything thats threaded to mate the gas bottle threads from BOC. Pretty much have to buy from them, get something made, or use paintball stuff.
Good luck and let us know how you go.