General purpose tip for Gluing:

Isopropyl Alchohol in a spray mister will speed up Superglue bond time from minutes to seconds.

Mixing glues can be very useful. For example, I'll use Epoxy for the hollow insides but a drop of Superglue where pieces fit together to hold the pieces together while the Epoxy cures overnight. UV glue is fantastic for that because it cures instantly. But a drop of Superglue with a spritz of alcohol works good too.

If you're up to a bit more complex of a job, I have files for headphone bands to replace the whole hinge and band with either 3D printed or cut metal.

3d printed can be done with any printer either as is or flat and then shaped with an oven to specific designs.

Metal needs only a dremel, drill, and sandpaper and can be made out if sheet steel from any hardware store. Bending is done by hand or 3d printed jig.

Both use 3m screws to be adjustable but can be glued in place if prefered.

I think you're cooked with adhesives and are going to have to modify them for a proper repair. If you keep at adhesives, make sure you're curing properly with temp, weight, time.