These butane stoves are probably not stout enough for stir fry. 7K BTUs is another issue, as the 25K large burners on a range are marginal at best. Think about your 65K BTU turkey fryer propane burner as what to strive for. But that’s an outdoor activity.
Good point about the BTUs. Looks like even the indoor propane burners don’t put out enough heat. The nice thing about the outdoor types you mention is that they’re relatively inexpensive. Maybe I’ll do some stir fry on the porch this spring.