I've got a Proflate which came with a few cartridges but am now down to one.  It says you cannot use any aftermarket 16g ones with it & they even state this all over the tyreinflators.co.uk website.

Has anyone successfully used a non-Innovations cartridge in theirs?  If not then it may be cheaper long term to buy a different inflator

I got an aweomse inflator...quite simply just a tiny little L-bend with a spring...super light.

Just wear gloves, it burnt my hand when I inflated a tyre without

I've one of those somewhere too but like the convenience of the Proflate.

You could do with something like THIS by the sounds of it.