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Reviewing through your inquiry there are a couple of options available:
1. I would suggest checking out the Author Change Add-On developed by our Professional Service's team. While this does not have a bulk function, it does allow you to reassign an author of content via the UI.
2. This has also been raised as a potential feature enhancement for a future release Change Author of Content so would encourage you to help vote it up if this is a feature you are interested in seeing.
3. If you are interested in developing a custom feature leveraging the API, I would recommend reaching out to the Developer space here in the Jive Community where you can collaborate with other developers on potential customizations you are interested in developing.