D&D 5e OGL Sheet - How to handle slot-based inventory

I'm wondering if anyone has come up with a solution for handling slot-based inventory using the D&D 5e sheet. I'm really interested in the slot-based system described in Giffyglyph's Darker Dungeons , but I can't use the Darker Dungeons roll20 sheet with the pre-made adventure modules I'm running. Anyone have ideas about how to do it? I have some ideas for a very hacky script but I don't want to start on it if something already exists.

I don't have any experience with API, but clearly the 5E sheet already has a system in place to ensure a character is not wearing more than one set of armor, so maybe reverse engineer that to apply to other "slots?"