How do you use your horse? For trail riding, or do you show? I would limit anything containing alfalfa hay, which will only make him more susceptible to laminitis. Same with the grain. Very rarely does a trail horse need grain. Having said that, you’re right–you don’t want to turn him out in a field where he can eat grass all day long. Are you available to turn him out for short periods of time to graze and then return him to his stall?
Yes. That is a possibility. I use my horse primarily for showing.