SUCCESS!!
So first, let me apologize for taking so long to complete this test. But the results were well worth it!
Long story short (as you may have guessed), I was able to buy the new fob as listed below from eBay and successfully program it with my IIDTOOL:
The eBay seller I got the FOB is gzbacai201602. For the US, get the FOB that is 315MHz with PCF7941 Chip.
I did have a bit of searching to find a place to cut the key for me - and this story is an added bonus:
After one locksmith recognized the cut (that he could not perform) as a "New Ford key", I decided on a whim to try my friendly neighborhood Ford Dealer. The parts guy said "Hmm let me see it. I'll try the machine and if it gives me a green light, and a good image, It should work". Sure enough, green light, and he liked the image. So he cut it. I asked "how much do i owe you?" and he said . . . "eh don't worry about it - it was just a click of a button". I was giddy.
So yes, I got the LR3 key cut at a FORD DEALER. For free. (Well, yours may not be FREE, but if the Dealer can cut keys, they will duplicate the LR3 perfectly)
I doubt this key has the rechargeable battery, but perhaps another seller with the correct specs
could have a better version . . . but for this price, I can buy a new one every year and still come out on top.
So all in for $15 and change - now having a new functioning backup key - I can't stop laughing!