ive known a few that "dosed" there plants with co2 a few times a day.

in your sealed bloom room kill the vent system for 15mins and then "dose" that room with co2 for 15mins. after that 15mins your vents will turn back on and exhaust the room making it safe again. they did this a 3 times a day.

might be an option to think about, couldn't imagine 15mins of co2 damaging your plants.