I called and moved my reservation to Thanksgiving. Changed it to 2 nights instead of 3 and used the leftover value to get another 3 day flex base ticket for DH (since he wasn't going to come on this Spring Break trip). Paid another $55 OOP.
I asked to leave the 3 tickets I already have alone, which didn't seem to be a problem. I have the same Delta Vacations confirmation number. The tickets show up as Activities 1 (original 3 tickets with the same ticket number) and Activities 2 (DH's new ticket, no ticket number which makes sense). So all appears to be in order.
But I will watch it on
MDE. The tickets on MDE now show them as valid from 4/4/20 (my dated ticket date) to 12/15/20, so I won't need to worry about getting them changed unless my dates change.