The werebear is already in the gamejam ... They should just throw it in dawnguard to some npc and release it ...
You're okay with content just being "Thrown in" without polish, precedence or context?
That's part of the reason I absolutely hate content mods, and a lot of DLCs. They never integrate themselves into the core experience in a way that makes the transition mostly seamless. That's what made Morrowind's expansions the best overall. Not only did the content deliver, it delivered it via a natural means. No magic radio signal or omnipotent journal entry. You had to ask around about "An Island to the North", or get attacked by the Dark Brotherhood.