I have an elderly chin that has almost NO TEETH. He had abscesses and cancer, and they were removed. Since then, he has sort of formed a callus in which he mushes soft pellets and soaked hay side to side with.
He was on CC for an awfully long time after the teeth came out and during the medication saga. We gave up on him taking the syringe--that was a huge battle that required re-stitching
So we started him a warm mash of his normal pellets. He liked the familiar smell of those and the mush he could just "mouth" up. He was so successful at that we got creative with the hay.
We chopped up hay very fine, and then soaked it til it was soft. That was successful too. In the summer, we give him fine, well dried out grass hay.
If you want any directions, let me know. I could even just send you some of our supply if you thought it would help you--I would be glad to.