Models with more than one expression

[Qw2]

I'm still confused sorry, what I'm trying to say is I want the model to be able to have different expressions still, including blinking.
I'll try this too though. I'm planning on attempting to turn it into the MMD formats anyway and not all models are too expressive.

You mentioned that you wanted it in MMD which I have some experience with, so I attempted to port the model with the expressions intact.
https://drive.google.com/file/d/16ESboWI...sp=sharing
With that in mind the original answer to your question would be to use material morphs to change the alpha rather than just deleting some of the mesh.
Anyway, for the pmx just use the morphs in the 'other' section to choose the expression. There's no blinking expression though, I think that you're supposed to use the "brow" bones to emulate it.
Sorry for all the confusion, I think I just wasn't exactly sure what you wanted to do.