I took the Asura's Star from the quest. But now I really regret it. Getting soul trapped Grand Soul Gem creatures in Skyrim is a lot rarer than people.
Is there a way I can use a console commmand(s) to switch my star out?
I don't know about swapping, but you could always just put the Black Star in your inventory using player.additem 00063B29 1
Doing that will put the Black Star in your inventory. It should then be possible to remove Azura's Star from your inventory by selling it. Before you do that though, I'd suggest simply placing Azura's Star in a chest and taking the Black Star for a test run, to make sure it functions properly.