My multisite network is NOT built at the root of my domain,

My multisite network is NOT built at the root of my domain, rather it is in a directory domain.com/network/

It seems that the WPMU DEV domain mapping plugin does not work in this situation and I'm wondering if there are work-arounds. In other words, if a user signs up to build a site (via my Pro-site install) and wants to use their own domain name, is that possible? If so how?

I did find this patch to another domain mapping plugin that sounded promising, but I could not get it to work either.
http://patchlog.com/wordpress/wpmu-domain-mapping-in-subfolder-install/

Thanks!