I just wanted to update everyone. A healthy May Duke specimen is present in the UK and the owner agreed to donate scion to the US ARS. They agreed to import it, certify it virus free, and then add it to the tart cherry collection in Geneva, New York.
That would not have happened if not for the discussion on this forum and the sharing of our interests. I think it will probably take several years before any of us can grow it, let alone taste it. But this cultivar was at risk of being lost and now will be saved. Just wanted to let everyone know. It will probably be at Monticello again in healthy form one day.