Hey, I don't think there is a simple mel command to do that.
you can dig around in the MEL scripts for those GUI's and see how they're doing it. I looked for a little bit, and if you echo all commands on the reset of rebuild surface option box you get:
rebuildSurfaceSetup OptionBoxWindow|OptionBoxWindow|formLayout63|tabLayout6|formLayout65|tabLayout7|columnLayout2 1 "";
and then the command to generate that is in the mel script performRebuildSurface.mel, it says
-command ($callback + " " + $parent + " 1 \"" + $goToTool + "\"")
rebuildSurfaceSetup is the actual procedure to reset that specific GUI
so you'd just need to dig around and gather those variables (like $parent) to recreate that same reset command.
But I'm not sure all the GUI scripts are written the same, if they're not, then it'd be hard to make a unified reset command.
Good luck!
Jason