If you do decide to go for the possibly quicker but less sure route to snows by breeding the het albino to the het axanthic then you could keep back all the female possible double hets and buy an unrelated for sure double het male (careful of compatibility on the axanthic line) to breed them to. Still a long multi generational project with no assurance you will even have the double het pair to get the 1:16 shot at snow eventually. But I'm doing worse, I'm breeding a possible double het male to a possible het albino female.