The GasOne stove connector would be used on a tank like this one with the large external threads on the valve, known as an ACME fitting.

I'm not sure what a "Malta" style connector is but if it's like the old POL (Prest-O-Lite) connectors with internal threads, there are adapters like this one.

Another option not much larger than the dual 1 lb. setup would be a 5 pound tank. I have one of these for my Weber Q grill as I wanted something smaller/lighter than a 20 lb.

Not that I don;t appreciate marketing and innovation, but I have a generic 5lb tank I bough years ago. Something like this....

https://www.amazon.com/Flame-King-YSN5LB-Propane-Cylinder/dp/B077BLDL7T?ref_=ast_sto_dp&th=1&psc=1

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That seems very pricey for a basic propane tank that sits in a milk crate, but this is the snow peak group, so make an IGT adapter for it and I'm all in :-)