I think those bags are a beautiful idea. After having three children though I wouldn't be worried about what your birthing partners are doing, if they are preoccupied etc...you need people in the room focused on you and your needs. If you want to play monopoly then go for it but I highly doubt you will )
I would focus more on prepping them for the birth and what you want to happen. I know you have a doula but having other women in the room intuned to you will be invaluable
Good luck xx