There are new GLTF functions to use with llSetPrimitiveParams but they’re currently a huge pain in the butt to work with, especially if you want something to be backwards/Blinn-Phong compatible. Even something PBR switching transparency isn’t a simple process atm. wiki.secondlife.com/wiki/LlSetPr...

LlSetPrimitiveParams

Save multiple versions of the same material and swap that instead of the alpha mode.

Thanks for the heads up! My scripting knowledge is severely limited to tweaking existing scripts.