I'm not trying to be smarty, but wouldn't you be best off getting a cylinder to fit the regulator and throw away the disposable as it'll most likely only last a couple of minutes?
Sounds like a plan. I'm new to all this stuff and got a small non disposable cylinder from adams gas and was shocked how quickly I got through it! Going to get a much bigger one next time!
They do Malcolm, I used to use this one when I started off on disposables. It will probably come in handy again for a small argon bottle in the future.