How can I send a specific SKU based on options selected?

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So I've got a product in 3 sizes, you can select one of 6 colors, and then choose a letter to highlight from the alphabet (26 options) Obviously, this blows out Shopify's 100 option per product limit, so I've got Bold Product Options (BPO) installed to let me show more options. I also created products that are hidden with the variants in the store (all three sizes, one color, all 26 letters, per product)


Here's where I'm stuck. I'd like to have the order sent automatically to print based on those orders, but I can't figure out how to assign a variant SKU based on the combination of variants with BPO. Any thoughts or ways to do this?