Not worth the time and money. It would be very funny for these 'error' coins to suddenly start popping up. With questionable quality. So while yes someone could do it, it's unlikely. If there was one out there with an error like this or more it would of made its way to the public eye by now.
Not to say that yours was done this way, but thats not really true. I hadn't thought about it before, but I could electroplate any shapes someone wanted on a coin for less than $20. You just need a couple of acids, a bit of gold, a battery, and plastic wrap with whatever shape you want to be plated cut into it.
That said, that comparison is like saying collectors coins with flaws are worthless because someone could get an unflawed coin and replicate the flaw themselves. Things that are messed up straight from the mint tend to have a higher value with collectors.
