Fun idea: It'd be kinda funny if Francesca Lucchini knew how to do this. The one Remilia referred to as the source of their spell cards was a Romanian witch, after all, so who's to say she never passed it down?

As for why Lucchini would never bother much with them herself, she'd probably say they need too much power to make regular use of them, and also they're finicky things to make. And we all know how closely she relates to her familiar. :)