Pro Sites Changing Admin User Issues

I'm trying to brainstorm how to use Pro Sites for pre-made websites, and have a couple of questions hoping to get some guidance.

Can I pre-make several websites using Cloner, set a Pro Sites level and assign the same user to each one?
related: can/should sites be batch created and then overwritten by Cloner, one by one. or batch created using New Blog Template?
Then give someone the username and password so they can login and add themselves as Admin?
Then when the subscription expires... not sure how that would work as far as renewing or suspending the account.

of course I'd like this to be automated, but will do manually if need be, just need to map out the steps required.