Multisite to Single Site User Sync?

Hi,

I've got a large, production, multisite install with ~100 users configured across about 175 blogs. Now, the training guys would like me to setup a training site for them to train new users. I don't want this training site to be accessible to the public, so I don't want to create it as another site in the multisite install.

Can I use User Synchronization to sync users from the main multisite user list into a standalone WordPress install that's stored on our network (i.e. not publicly available)? I can understand not using multisite as the target/slave, but I'm optimistic it could be used as the master.

Thanks!