You may have to put your bunny Mom foot down and make the Hay and greens an only choice until his eating habits improve.
I am not an expert on Stasis ( fingers remaining crossed) but my understanding is that the gut is NOT moving which is the issue.
He may pout for his pellets, but once he is hungry enough he will eat the hay. I weaned Coco off her pellets about 8 months ago because she would gobble them like there was no tomorrow and then get cecals EVERYWHERE – and I do mean everywhere – My bed, carpet, on my feet as I walked across them into the hallway. YUCK.
When Jackson entered the family, I gave some pellets again – because he needed them and I was changing his diet from the pellets at the Shelter to a mostly greens and hay combo.
Coco got insta-poopy butt again.
Now, Pellets are treats – like papaya. Every third day or so, I sprinkle about 2 tablespoons in with their hay so they have to root around to find them. Or, I put a small amount in my hand and hand feed them so I am controlling their portions.
I am wondering if you increase the greens a good amount – then leave the hay out for browsing/munching through the day if he won’t give up and eat the hay.
And I understand about stubborn. I think all Bun Parents know the stubborn.