Thank you for your interest in migration.
I'm the guy who handled the migrations for the Hoppe boards, and am the main point of contact for migrations.
You can email Acid at email@example.com or myself personally at firstname.lastname@example.org. Please provide some proof of board ownership (pic of the board moderation page or make a post with BO role signature on the board in question) and we will help you to migrate.
Hoppe-sama's boards were migrated with an altered version of Robi's migration script. Due to a number of issues with that I am writing a new one from scratch. You're in luck, since I implemented vichan scraping first. It still needs some work but we are almost there. I'd be happy to keep you apprised of the progress.
Assume it's all-or-nothing. I might be able to hack in removing specific threads, but "consolidating" posts or threads isn't feasible.