Well, if they didn't want to go the straight ninja tools route, they could have ALC craft Magic Vials that are not consumable but are necessary components for SCH "spells."
Of course, a SCH that requires non-consumable items to cast spells has to have some other limiting factor; if that factor is MP, we're playing semantics and it's still a mage. So a chemist SCH would either need to be consumable-based or TP-based. I'd prefer the former.
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