[arch-general] Question on removing pacman keys (and adding new ones)

Hi there! In relation to making virtual machine images of Arch I noticed that sharing images with pacman keys inside would enable two systems to present spoofed packages to the other unnoticed. True? It seems like a good idea to remove and re-add pacman keys specific to each system again, later. I wonder how to best remove the system-specific keys (not secure deletion, just not breaking the system) and how (more than when) to re-add new ones to the existing system to get it back to fully functional. Any ideas? Many thanks in advance, best, Sebastian