For lower lid retraction, they first tried cadaver pericardium on me (2 times on the right eyelid and 1 time on the left) but within 9 months the lower lids fell back down to my cheek bones. I was then told that for as severe a case of TED that I had, it was just not strong enough. The next surgeon I saw, then used my ear catiliage. This has served well. There was more pain with the ears healing than the eyes but they finally healed.
I would think if this is an option for you that it would be more palatable than a palatal graft. You might want to ask if it would work for you.