looks like I can chime in a bit
Here are the threads I went thru:
DIY: 2007 FJ Key Fob Swap
Key Fob for 2010 FJ Cruiser
there was another thread and I forgot which was it. It has the most info.
I ordered a 12BBY all in one key from amazon, that didn't work
I ordered 1 12BBX from ebay ($~20) and it's gonna arrive sometime next week, so I will let u know if that works, which it should.