pipeline between Medium, Unity and Substance

How do you move back and force your assets between these programs?

What I got so far is this:
export fbx from medium
bring into maya correct scale and orientation and export fbx
import that fbx into substance painter (is there a maya <-> painter direct pipe?)
export obj from painter (can substance painter export fbx?)
import that obj in maya and export fbx for unity
then you can do the round trip between maya and unity

Seems like a few steps could be collapsed as one but so far no luck.