I was looking at the disposable canisters for backpacking (I'm not considering sticking a 5-pound refillable canister in my backpack <img src="images/graemlins/cool.gif" alt="" /> )

It was just that the disposable canisters from Coleman (used in Coleman camp stoves, lanterns, etc.) are more readily available and significantly cheaper than the Primus disposable canisters. But it appears there are more serious issues than just a different connector.

I intend primarily to use it with white gas (which is at least as available as disposable canisters) and in an emergency I would use unleaded gasoline (or even aviation gasoline). I bought a small Primus canister which I can toss in as an emergency supply, but they're quite a bit more expensive than the white gas.