I also had success with Xylazine.
And have another conversation with your vet about reserpine. My biggest regret from my horse’s rehab is not hitting bigger drugs sooner. He was a week away from starting under saddle work after 3 months of stall rest when he re-injured himself. That lengthened his stay to about 10 months total, and I blame that re-injury and the extra months on stall rest, fairly or not, for the complications that he developed that ended his riding career.