It's actually rather simple, just a bit of thinking outside of the box. Always good to predict where your positions in the endgame must be in order to comply with blocking pathway to disable further movement:

Orange -> up, right

Green -> up

Orange -> left, down, right, up

Green -> left, up, right

Orange -> down, left, up

It frustrated me so much that in the end I gave up and wrote some python code to solve it.