One thing you learn in threads like this is who one would trust when dealing in coins and who one might not trust as much. If you artificially tone the coin and sell it as natural toning and hide the cleaning, and sell it off, this is criminal fraud under the law... and many people get away with it and there is a small choir of people here who think that poses no problem.
Then you'll have to agree that all of the members posting in this are trustworthy. Please take the time to read the posts. NOBODY posted that they want to sell these as natural coins. In fact many have recommended marking the holders as cleaned and retoned. The OP wasn't looking for a tutorial in how to make his coin fool others into believing it was natural. He was looking for advice on how to make a harshly cleaned with an unnatural shine look a little more pleasing in his collection.
Trust me, these bozos won't know it. This whole thing about "AT" is a big crock. You won't achieve an "aged" look, there's the problem, there. It'll look like abrupt onset, however you do it. Costume jewelry. Flat; superficial. Some Sun might impart some depth, but you really have to keep tabs on it, if that's where you're going. You leave it too long on the Sunlit windowsill, it'll black out.
Artificial toning and natural toning are meaningless terms. Toning that appears natural can be achieved with intent to tone the coin in an accelerated way, much in the same way that improper cleaning is different than conservation. It's all about proper technique. Toning is either market acceptable or it isn't, and the toning the market finds acceptable is a moving target.