I have a cross beaked EE rooster.
He has trouble eating out of a regular chicken feeder, so I took an empty #10 can (one of those big cans that institutional food comes in), filled it two thirds of the way with sand to weight it down, and then in the upper third of the open can I put layer pellets. (He lives with 13 hens, so he eats layer pellets just like they do).
Between me and my wife, we fill that can several times a day since other birds besides my cross beak rooster eat out of that can.
That can is the only thing that the rooster can eat out of. He looses some of the pellets he tries to eat, but he can get enough of those pellets out of the can that he can fill himself.
The poor bird is not able to eat much else. I give the birds treats like pieces of whole wheat bread, cut up tomatoes or apples, grass and weeds -- but he can't eat them, bless his little heart.
About the only treats he seems to be able to eat is watermelon (which he pecks off of the quarter sized wedges I give the birds) and cantaloupe. Please note that he can only eat these fruits if they are still on the rind. He can't eat the fruit if it is cut off the rind in chunks. He needs the large area that a fruit like watermelon allows him to peck, and he needs a fruit that will not move in any way while he's eating it.
Thing is -- he's actually very happy and healthy. My wife and I make sure that he has food in a container that he can retrieve it from (the weighted down #10 can with its wide mouthed opening to eat out of provides this, as does the rind of the watermelon). And we make sure that the food is close enough to the top of the can that he can reach it.