Throat is clear . The bike is soft I think vitamin deficiencies. Do you think green beans will help ?
Peas not beans. No, you will need to get liquid calcium with added Vit D3 from a petshop. If you can't get, try to get cuttlefishbone. Also has lots of calcium. You can crush till fine powder and mix in with his food. But then he will need direct sun exposure for about half an hour every day. Birds get their D3 from the sun and this helps with calcium absorption.
Is the crop emptying? You haven't posted a photo of his droppings.