Hey zgwortz,
welcome to ESO lua developing.
Afaik there is no library for new added/updated icons at the inventory lists.
Don't take my addon FCO ItemSaver as a copy&paste addon as it grew during my learning sessions of lua
I bet there are several parts I could improve in it.
But the general approach to hook the inventory listView and add the textures is the same as ItemSaver is using:
-Hook the PLAYER_INVENTORY.inventories.listView.dataTypes[n]
-save the original callbackFunction
-create a new callback function which calls the original callback function first, and then execute your additional code
You can check my addon's function CreateTextures() to get the code example.