I would NOT hang a copper wire in the carboy. For one, you would not now how much copper is going in. To much copper can cause bitterness and prematurely oxidize if your not careful (and is a heavy metal that can cause health issues I high amounts).u can also try putting a copper wire in your carboy - let it hang - make sure u sanitize it - and make sure its 100 percent copper - works very well - smell will be gone in no time
I don’t think you are at that point yet. Keep smelling when you are stirring during malo.
Also, as stated before, reduless is a product you can use. It is a inactivated yeast product with high copper content. When used, it leaves very little residual copper behind.
Usually reduless takes care of things after 1 or 2 doses (sometimes more). Copper sulfate solution can be used for more difficult cases (but you would want to do small bench trials)