The issue with mojave and producing a Bel is that you will produce more than BEL some may have additional genes along with it, and from the PET standpoint people will not care if they are a white snake even if it has pastel pinstripe or spider it won't matter to them and will not want to pay more, some may even have issue not wanting the spider gene in their animal. Identification will also be an issue on your end.

Personally I would go with some Hypo Leopard combo along with other genes depending on your budget, you definitely want hypo since your female is het hypo, and Leopard works very well with the other genes.