So they are all het red axanthic? I would say get something that is red axanthic. If you buy 1 male with 5 females being het I'm sure it will be worth the money having all 5 females being red het. Or get a red het male.
Or if you don't care then you could always just breed any morph you want (codom or dom) and it would just be like breeding to a normal normal.
Just searched Kingsnake and found a few het red axanthic males.