Any site that is not still in beta can request up to five user-initiated migration targets that will be set up by the Community Team as needed. There's a nice FAQ about migration over on the main meta site. You can request these through a meta request like this and we will consider them.
For right now, I don't see a need for this migration path.
The last ...
There are only three custom close reasons allowed, and these are currently set up to be:
I asked for the last one to be added, because the beginning of each northern hemisphere academic year always brings students asking for us to do their homework.
As a moderator, when I select the off-topic option, I can search for a more appropriate SE site:
but then ...