The shader system should be converted to the same system that armor and weapon mods currently run on. When you get a shader for first time, it's permanently unlocked and in your inventory, When you want to apply it, you just pay a small amount of glimmer.
I don't think anyone enjoys the laborious task of deleting huge stacks of shaders. This has been a problem since early D2, and I think the new mod system is a good template to fix it.
-
Considering how long it takes them to make meaningful changes in this game, expect the shader system to change in 2025. They never should have changed it from the D1 system.