i wouldn't put him on the butter female, if you get a Blue Eyed Lucy there is no way in telling if it has banana and or yellow belly in it,

i think the same goes for the yellow belly female, if you get an ivory i dont think you can see the banana or the butter in it.

but that is just me if you dont mind hatching+selling BEL's for what they are worth where you are from with the chance the buyer is getting banana/butter/yellow belly in the snake for free then go for it