Thank you, @simon - this is very helpful.
Yes, from what you say, suspension seems like the right approach here. But I do have a question about the eMails sent. I have CRM-based eMails that are sent when folks cancel so I don’t want Discourse to send anything at all.
You mention “If a message is given when the user is suspended, that message will be sent as an email to the user.”.
If I do NOT provide a message, does that mean that nothing is sent and i don’t need to worry about updating the template at all (since it will never be sent)?
Just looking at suspension, perhaps I am a little unclear about how the “Suspension Reason” and eMail fields are used.
Basically my goal is to suspend the user and do absolutely nothing else 
Thank you again.