Batch Export/Import

I'm working with a client on a major content refactoring project. We're handling the transforms that normalize and refactor the DITA content. The client's tech services team is handling the tooling around export and import of the content. We're on Tridion Docs 14 SP2.

Here's the high-level process we've outlined for the process:

1. Upload CSV with list of publication GUIDs.

2. Extract related maps and all components (including conref targets).

3. Launch DITA-OT to normalize and refactor DITA content.

4. Load content back into Tridion Docs.

I need to give the tech team some direction on the best approach to use. I've heard a lot about people using ISHRemote, but as a nondeveloper and knowing only about about PowerShell's functionality, I'm not sure of what ISHRemote can and can't do. So my questions for you are:

1. Is ISHRemote the best avenue for automating this process? If so, is there a good source for information about its capabilities? I've foind the GitHub page and Alex's blog post but little else.

2. Is Content Importer the only means by which we can reimport the refactored content, or do the Tridion Docs APIs provide other methods?

3. Do frozen baselines prevent export and import using API-drive automation approaches like this?

4. Any gotchas to watch for or any problems with the high-level process?

Any tips you can provide would be greatly appreciated.