Forum Moderators: Robert Charlton & goodroi
we're forever being told to link as if the SEs didn't exist
And then, of course, you wind up with the possibility of a site being considered a dead end.
I'll make the assumption that the sites from which your IBLs are coming from are not ones to which the new site should link to. If there's nothing to link to, I guess there's nothing to link to until something else comes along in this very novel niche.
Barring anything else you might have to depend for awhile on internal supporting pages. I'm a big believer in splitting related content into different category directories and inter-linking lower level pages. This at least gets some extra link text juice.