You can confit the legs. Vaccum pack with a few tablespoons of any type of fat you want. duck is classic but bacon fat, olive oil, butter all work too.
I like 158 for 24 hours, but have done a few degrees hotter for 8 hours and that works as well.
Shock in an ice bath.
Whenever you want to eat just pull out a bag, throw it in warm water for a few minutes to melt the fat.
Heat and crisp the skin however you want.