MaxIm supports Configurations. It allows you to setup everything as you want it, and preserve those settings. Then later you can load the Configuration you want.
You can find this under File... Configurations.

You might create 3 configurations:
Scope1_CameraA_GuiderX
Scope2_CameraB_GuiderY
Scope3_CameraC_GuiderZ

Then load the one you need.

There is also an upgrade to MaxIm DL Pro called MaxIm DL Maestro that allows you to launch MaxIm with a command line option to pick a different configuration. There are other capabiliities for running multiple simultaneous instruments, but that's a bit beyond the scope of what you're trying to do.