Migration paths aren't added to sites still in beta, so you'll need to revisit this after you launch. When that does happen, mods need to demonstrate that you've had a good number of posts that should've been migrated to Crypto and Money; devs won't add a migration path unless there's a clear need for it, to avoid opening the door for bad migrations
Migration vote paths are only added (by developers) when there are a quite big number of migrations from one site to other sites.
But this should not hinder you from initiating migrations to other sites (and please, don't simply repost questions):
♦ Moderators (for your site, your new Moderators Pro Tempore, as well as quite a number of SE employees) can moderate questions everywhere.
They will often (other than in really obvious cases) consult with moderators of the target site before doing so (since the target site's moderators have a better grasp on what is on-topic there).
So, the way to go would be to flag the question, and put the appropriate message for moderators:
You can additionally vote to close as off-topic, then your vote will appear in the "migrated by ..." list on the closed question after a moderator migrates it.