Suggestion
Make emissive textures work in optifine without using connected textures mod.

Are you referring to Unity: Extras redstone or the base pack nether emissives?

I most likely won't be changing things since OptiFine only allows fullbright textures or nothing at all. I don't want redstone to be light level 15, for example, which is why I use CTM. For certain textures, sure, I'll use OptiFine for emissives.

I meant emissives overall.

Emissives that are intended to be fullbright will use OptiFine format.