"Anyone know if putting baby seats in the rear is safe with the side and curtain airbags?"
As I see it, it is safe. Side and curtain airbags don't go pop into "your space" as front bags do. They create a barrier in the space not typically occupied by the victim.
Loads of cars are equipped with both side and curtain bags + ISOFIX/Latch mounts. That would certainly not be permitted in the US if the car manufacturers felt they were risking lawsuits.