so when I create the workspace for them, I use my own email and then just instruct them to change the email once I give them the email and password directly to the workspace.
For sites, you can build it in your own account - create their workspace and make sure its set up - then transfer the site over - and you can do all of this before your client even has access to the workspace. And then do the same thing again - just give them your setup email and the password and tell them to change the email and password - and if they want you to help with changes - to keep you as a guest.
I usually do something like matt+clientname@ or whatever for the workspace email.
