Interaction between Flight crew and Cabin Crew....certain things never change! It was definitely possible for us, the result is a screaming 3 month old tinker who has started throwing his toys out of the pram (moody monkey just like his father!)
More seriously I doubt that tyhe crew will answer detailed questions about F/D access and communication on your flight, bear in mind it is an extra sensitive issue so do not be disappointed if they do not answer! If you get the job you'll receive appropriate training so do not worry!!