The iOpener works well, be patient and keep reheating until you can see the screen start to give a little. I kept putting mine in the microwave and it worked faster when the iOpener was hotter. 40 second intervals did the trick for me eventually
With my shattered screen, I was able to remove it using the suction cup slightly and a metal pry, had to break the edge glass some for removal also but it didn’t do damage. More layers of shipping tape helped to make the screen stay together better and come off more intact.
My screen from ifixit had the rigid flaps with adhesive also. I removed adhesive and adhered it to the new glass, it worked fine and solved the problem with the flaps not pushing down.