Interaction between Custom Pixi filters and RPG Maker MV

[Karbonic]

Hello! This will be my first post here.

RPG Maker MV is a small game engine which uses Pixi.js as it's main codebase.

Because of this, pixi filters are compatible with the engine by way of this third party plugin.
RPG Maker is a weird and finicky piece of software with a few strange pieces of design, so it's not entirely clear to me how far from standard pixi it is.

I am looking to make a custom filter that involves both the limiting of a games palette to a set amount of indexed colors, as well as dithering those colors to create a smoother effect.
You can see more details of what I have in mind here.

What I want to know is, how would I interface a custom made filter like this with RPG Maker? Would it be relatively plug and play, or will I have to adapt a bunch of stuff to make it work?
As a side question, is a dithering filter like this even possible, and if so, is it possible while not being too taxing to the average system?

Thanks! I hope to hear from you soon!