just put your males in a different room from your flowering room thats all you have to do it doesnt have to be on a different floor or across the house.
when your males form pollen balls wait until they are about ready to release pollen and slip a bag over them to collect it and 12/12 lighting will most definatly help them develop faster so wouldnt be waiting for them to develop fully under 18/6 when you may need the pollen sooner.
then shut off the circulating fans you may have in your flowering room and place the bag with pollen over selected branches and shake it a few times or you can use a paint brush and brush the pollen on the pistols on the selected branches where you want seed, mist or spray the areas with water to wash away excess pollen before turning the fans back on.
you want to use fresh pollen as it has a short life span and is not viable for very long.