Is there any way I can move any kind of dark swarm around the map? If so, how?
None.

We can't explain the universe, just describe it; and we don't know whether our theories are true, we just know they're not wrong. >Harald Lesch
No you can't.
You will have to remove and recast at the desired place.
Alternative you could use disruptions webs, which can be moved. (If that's an option in your case)