The butane hack was easy. I have two cartridges that I refill regularly with butane.
The only challenge as finding the right size butane filling tip.
I bought a cheap butane can from a big box store but the filling tip is too big. Bought (overpaid) for another from a head shop with multiple size tips. There was one that works with the cheap butane can, very pleased.
This plus pads from Malaysia and I am good to go.
P. S. If you want to learn the butane hack, just google it.