Took pics to my jeweler and asked if it could be replicated and the answer was - a lot of time, effort, money and he thinks I'm better off just buying the earrings outright.
... the rest of the design is basically step cut diamond and emerald melee calibrated to fit exactly into the setting, and then channel / bezel set (I can't tell), which my jeweler said meant setting it was a headache.
So it sounds like the main cost really isn't the two EC diamonds; it's the design and all the work that went into creating the total earrings. I think if you bought them, you wouldn't be able to sell the main EC diamonds for much, probably only a fraction of the cost of the earrings. So if you like the earrings enough to buy them at their current price, go for it. But if you don't think they're worth the price, I don't think you'll save any money trying to modify them.