In case somebody else has a double locked door won't open situation I found a photo I took that I've marked up with what I believe is the solution.
This is a photo of what I think is the rear left door actuator still in the car, I've v marked up there photo with a yellow arrow showing where you need to hook into the double lock arm and a Green arrow which way to pull to remove the double lock.
BMW was smart enough to put that on the bottom which will make it nearly impossible to do from the top with the likes of a slim Jim so you will have to get the door panel off with the door shut which will be the most difficult part of the job.
When I take out the next door actuator for motor repair, I will try to make a video showing how to remove the double lock when the door is closed.
I will use something like an unbent paper clip with a barb like a fish hook on the end. You need to grab a bump that is less than a mm thick on the edge of the motor arm.
Watch the overview video to learn the mechanism and you will figure out what rib you need to grab. It should not be very difficult. 3/10 difficulty.