Programmatically unarchive Project Areas and remove users.
2 answers
Yes, you can programmatically remove the users as far as I can tell. https://rsjazz.wordpress.com/2013/09/18/deploying-templates-and-creating-projects-using-the-plain-java-clients-library/ shows how to add users, so removing should work very similar as well. I would try without unarchiving the project areas first. The blog has more API examples.
https://rsjazz.wordpress.com/2013/01/08/maintaing-user-photos-with-the-plain-java-client-libraries/ and https://rsjazz.wordpress.com/2012/10/12/changing-the-jazz-user-id-using-the-rtc-plain-java-client-libraries/ show examples for the contributor/user API.