I removed the display and opened the case using a vacuum pen (small suction cup) instead of prying; still used heat, probably more than if I were prying, but it was easier than trying to get a tool into the tiny gap; a combination of the two would be less heat, and prying alone is probably the least heat. Be careful not to overheat and damage parts you want to keep. I damaged the heart rate sensor and probably the display (around the edges, it isn't going full dark and I can see the touch sensor lines); I'll update if it returns to normal, but it's been long enough already that it's back down to room temperature.