When I click the off-topic choice because I think a question belongs on another exchange, my only choice is meta.health. What about Biology, Psychology, Fitness, etc? What does it take to get those added to the list of options?
As I understand the policies, it takes for us to get out of beta:
Beta sites don't have default migration paths (although moderators can still migrate to/from)
and for the target sites to be out of beta as well?
That means except for things really belonging here on HealthMeta the option "belongs on another site" is useless and will remain so for a while.
The workaround is to vote to close with a custom reason, stating the presumed target site in the comment and optionally flag the question for moderator attention.