Unless all your code is written without schema names in queries, updates, etc., you'll need to do far more than just rename them all.
I don't think there's a way to just rename a schema and have it work. sp_rename only works on objects that are in sys.objects, and schemas aren't one of those.
You're probably going to have to rebuild the database pretty much from the ground up. I could be wrong, but I will be surprised if I am.
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