Dungeon Crawl Classics are a Goodman Games product. Blackmoor--despite what many people believe--is not.
Blackmoor is published through Goodman, but it's a Zeitgeist product. It's the same way Necromancer Games publishes through Sword & Sorcery, but they're still a seperate entity.
Co-branding like what you suggest would, I fear, simply do further harm to a brand identity that (as this post suggests) is already having some issues establishing itself.