My senior mini stallion is now missing 2-3 molars, could be more now, I've lost count. He gets soaked senior and hay pellets twice a day and has free access to chopped forage, which he rifles for the choicest bits and leaves slobbered on, coarse bits behind (which one of his companions happily eats his left-overs, slobber and all, so I have no waste). In the summer, he goes out with his companions on grass and he quids fresh grass. [If he doesn't go out daily with his companions, he quits eating, so it's better that he goes out and quids a little hay, then to go off feed completely.]
I've tried several chopped forages, his favorite seems to be the Standlee alfalfa/timothy mix or the straight alfalfa chop. He's also had the Dumor chopped timothy/alfalfa mix, and ate it fine. Both brands are fine, and I've found finer and coarse bags from each brand. We've also tried, several other chopped forages which he didn't care for, but yours might like them: Triple crown Safe Starch forage, Standlee chopped timothy, Dumor Hi-Fiber, several varieties of Lucerne Farms chopped (he likes some, doesn't like others, I can no longer readily get it, so have lost track of which he liked and didn't) and TNT Chops (haven't seen this one in several years, they may no longer be in business).