The halter the muzzle was on is a breakaway.
I landed on when there is a roundtable in the pasture, he doesn’t have to wear the muzzle, but isn’t getting hay in his stall other than a handful of “pretend breakfast”. He gets a couple ounces of teff grass pellets every hour via is auto feeder while he is in the stall, about 2lbs total. He is one of three in the pasture and they aren’t inhaling the roundbale so I think this should be a decent balance.