I’d be down for mass import as long as it’s done well.
My idea is either do it with selenium, simulating the usage of a normal user on the website. In that case, every post would have my user as the creator and would generate a lot of spam in the front wall. Or it could be done directly to the database, but that would create bogus users that would be unavailable to use for anyone else. I think it would be better to do the later but with a reserved user that you create only for that purpose and has a descriptive name like “bot”. Let me know your ideas.