Applying textures outside of Studio

[Cryomancer42]

I'm working on a project in Studio that requires an excessive amount of custom Minifigure prints to the point where it's outside the range of the Part Designers extremely clunky decal system (there's a lot of short and medium legs here); so I'm wondering if there's any way to apply the textures in a separate piece of software and then import it into Part Designer (I'd use Mecabricks for this project but I find its UI very frustrating and it just doesn't meet some of my other needs).