Well, Finally did it, but still not fully installed because I'm willing to use the stock fuse box. It was certaintly easier than I expected.
For the ones like me, who are a little missed on this, The BCM has two separated connectors, the bigger one is the A and counts up to pin59, and the shortest one, is the B and starts counting form pin 60. If as I, you have been lucky and your fog switch comes with the socket plug, you can reuse the inner female pins, but you have to remove the gray strip on the side of the connector to do it (don't worry, it's removable).
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With that being said, you can use the pin 80 output either on the stock relay box or do it externally . Pin80 from the BCM is connected to pin 85 on the relay, and pin86 is connected to battery+, so more than an output, pin80 act as an input switch. I hope I don't have to do anything more with the BCM. I'll post some pictures when finished