Julia,
If you get the key holder, send me a PM. I have a couple Gretsch keys laying around, and I'll be happy to drop one in the mail to you.
As far as glueing the loose seam down, there's several threads in the Restoring section on this. My personal preference is 3M Contact Cement. Apply a thin layer to both the wrap and the shell, wait 20 minutes, then clamp down overnight. Simple. Others may give you their preferred method.
Oh, and NICE drum!!