Please correct me if I am wrong.... but, I believe the Explorers equipped with an auto-dimming mirror use a Gentex model.
If the plug on it is the standard one, which I would hope would be the case, I think it would be possible to swap it out for one of these mirrors:
Gentex
I did this with my wife's Subaru and it was perfect. You can find the different models on Amazon at a savings, and installation is straightforward. Took me about 20 minutes to install, and that was mostly because the Subaru needed an adapter that most American cars shouldn't.
From what I understand, the universal opener in the Explorer can be finicky to program with some devices. The Homelink is super easy.
When my wife buys her new Ex, I will pull the one out of the Subaru and slap it into the Ex. That way we can have 6 things programmed, and an extra compass too!
Update:
So I stopped by the Ford dealership today and did a bit of investigating. The connector on the mirror (which is a Gentex) must be custom for Ford. The Gentex mirror in my Subaru has a smaller connector, while the Ford has a larger connector. Both have 3 wires leading to them, but the Subie mirror also has a jumper wire mixed in, that is on my car, which came with the mirror factory installed. I will check my wife's car when she gets home, she has the after market mirror that I bought and installed.
I'll update again when I have a little more info.
On a side note, the 2012's still have the tin drum sound above the windshield, how disappointing!