Portal helpers but 3D using box portals.

(I don't know how to explain it further lmfao)

There is MiniScaled mod that helps creating scale boxes https://github.com/qouteall/MiniScaledMod/blob/1.18/README.md

I was thinking about having more sizes than 1x1 -> yxy

It's being considered

Making scale box is tricky so it's recommended to use MiniScaled mod