Thanks. I'll roll the dice at check-in. I don't have the membership card yet, but it looks like the *gold logo is on there from the picture on Turkish's website.
Flight's not for a few months, so maybe I'll let the TACA and *Alliance simmer a little and give a call and see if they can't attach it to the reservation before check-in.
I'll report back with success or failure. Flights are in mid-October.