I’d definitely love to work with you. You’ve clearly done some great work on the project!
I personally don’t need categories. I’d come to terms with it being somewhat easier to manually make categories and just replace the category ID in my data with the new categories. That would definitely break the spirit of the full import though.
I definitely don’t need anything for doing 301s or avatars. Many users on my board use Gravatar or can just reupload. I don’t think redirects will add enough value to be worth spending time on. I’d just let people know they can expect some broken links for self-referencing links.
Do you want the Redis rdb file or did I turn this into a refresh of the json importer? I think to keep with the Discource folks plans of covering half the cost, we’d have to do the rdb file.