For an older horse I have a few tricks from my late 35 year old gelding.
He had choked a few times in his day before the vet and I solved the issue with him. He lived 10 extra years & had a healthier life and died naturally.
My vet and I decided it was best for my choking problem with starting with the salt block in feeder to feeding only in floor feeders and ground level hay and water buckets, wetting the grain into mash, second floor feeder for alfalfa shredded cube dust.
We then tried the best method that worked from then on.
I chopped his hay into shreds (with...... a paper cutting board...) laugh, it worked!
And put it in a plastic bag.. Then soaked it.
Harvey had a special made hay holder, made form a cut in half tractor tire. To hold the water & easy to clean.
After I soaked the hay for a hour and mixing it up a few times, I would dump it into his tire floor feeder and he could eat that for hours.
Most older horses will chew and suck on hay. Until they suck it dry and spit it out.
If its all nicely chopped fine and easy to chew they have a better time swallowing the small stuff.
It helped my old friend maybe it could help your beauty :)