Have you at any time been in contact with the previous developer @smokin35?
I see on twitter he still has an image of a sync chart .
I think I tried at the very beginning, especially when I was accumulating SYNC over the counter. but not in years
Maybe we could contact him and see if he has something in mind.
A NFT is not a bad idea , there are a lot of people who remember sync , at the time it was very well known , it was worth more than the btc for its low supply .