Can you have a car seat parent-facing and the bench board together?
You CAN. The bench seat, however, has to be closer to you - on the rear position (even if not with a car seat, I mean just like we use it in this in-depth Quinny Hubb stroller review. The car seat will be higher as it will need adapters.
Be aware, however, that the child sitting on the bench will have a limited space (depending on the size of the car seat).