Hello,
the SMC controls all the communication between SEPM and it clients. If you stop it, you can't start it again from the SEPM because there's no communication to send any command!!!
That is, there's no way to stop SMC from the SEPM, this is on purpose to prevent customers shoot on their own feet...
If you need to act on SMC, you need to do it out of the SEPM, hence you will be forced to think on how to start it again since the SEPM can't do it.