Not sure about the availablility or benefits of the other rat/mice species mentioned in your post, but I do know that pigmy mice would be way to small for even baby pythons. An adult pigmy mouse isn't much bigger than a 2-3 week old fancy mouse. they are also not easy to breed in captivity, I think.

The best way to deal with finiky eaters for the novice is avoiding wild caught ball pythons, buying captive breed instead. This way they are already feeding on fancy mice or rats.

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