From my limited experience opening the iMac, you risk inserting the cards or other tools to far and cutting antenna or camera wires using generic tools such as you mentioned.
The “pizza cutter” iMac wheel is small enough that you don’t have the same risk (although you should be careful near the camera area.)
The “pizza cutter” iMac wheel is small enough that you don’t have the same risk (although you should be careful near the camera area.)