[Idea] Change model's render layer

[sockeye-d]

Is your feature request related to a problem? Please describe.

I want to make this trident model with a hole in the middle:

I can't, because tridents' entity models are hard-coded to use RenderTypes::entitySolid, which don't discard pixels that fail an alpha test.

Describe the solution you'd like

I'd like to be able to change the render layer of a model as part of the JEM file.

Does OptiFine do this

Not as far as I know