>Is a hair-dryer (used carefully ...!) ok to bend the heated wrap back again?
NO! A hair dryer or heat gun is what you use to -remove- wrap! You don't want to further loosen the glue bond by applying heat. Counter productive.
It's a simple fix. All you need is a couple of clamps and a piece of wood to use to press the wrap against the shell while the glue is drying.
Remove heads/rims/adjacent lugs/mounts/hardware next to the seam.
1. Apply a piece of masking tape along the edge of the seam (opposite the lifted part of wrap.) Just mask off the surface of the drum so no glue migrates (squeezes-out) onto the good wrap when you clamp down the edge.
2. Common 'fast bonding glue' (crazy glue) will do the trick. Apply a bead along the underside of the lifted/curled edge.
3. Lay the strip of wood over the lifted seam and clamp it down on both ends and in the middle if you have a clamp that is long enough to reach. Make sure the strip of wood is -flush- with the edge of the wrap, not directly over the seam, or you will glue the splint of wood to the shell!
4. Allow 24 hours for it to cure hard before removing clamps.
The seam won't come up again for another 20 years. Best of luck with your project.
John