Cloning site using multi-db

Hi there

I have a running multi-site using multi-db (256 databases). I would like to clone my site on a different domain name, but without all the current blogs (just the infrastructure - plugins, themes, settings, etc). This means that I don't want to backup all 256 databases. I want to publish the site on the new domain without the multi-db component first, make it work and then add the multi-db component again.

How do I revert back to 1 database manually (if I have the backup on my PC)? I don't mind that the blogs are lost. the site must just work again. I only need the main site working again on the new domain.