I'm not an electrical guy at all..hahah. Just to update though, that schematic did not work for me. I have the dimmer switch from Oznium, and with the first diagram the courtesy light circuit would not activate the footwell LED's. With the key on it worked fine, but as soon as it lost the +12V, the LED's would go out. I fixed it by running another wire from the courtesy circuit to the input side of the dimmer and adding another diode.
Results of this new schematic are as follows:
With the key off, footwell LED's function with the courtesy light circuit (on when doors are unlocked, on when doors are opened.
With the key on, courtesy lights go out but footwell LED's remain lit.
Dimmer has full control of the footwell LED's.
When the courtesy lights turn on, the footwell LED's remain dimmed to where you set them.
The only glitch I am seeing is that the "auto dim" feature on the courtesy circuit makes the footwell LED's flicker as it dims out. Not a concern to me, but thought I would mention it.
New working schematic: