Decided to shake things up a bit and tried using Substance Painter to make the textures. Blender's texture painting is godawful and flipping between it and Photoshop was too tedious. Getting the mesh to cooperate with Substance took a bit of trial and error, but it was a much better experience overall. Think I'll stick with this from now on.

You'll need ParentHoldLink: https://hub.virtamate.com/resources/parentholdlink-for-customunityassets.415/

And of course CUAManager to transfer the ear, tail, etc.: https://hub.virtamate.com/resources/cuamanager.547/

MEGA:https://mega.nz/file/BW8QlYjK

Key: ynKAUfin8P7uMPENrgQkF_GWgZR1kwq17nWpF1nLxDI

It's a zip file, so be sure to extract it first!