The boost system is very clever but expensive to operate, as the refills are pricey, and you cannot regulate the production level.

What you describe would be best served by a tank injection system with the output hose split off into a Y and run to each chamber and inserted into the back of an oscillating fan.

I paid something like $200 for my whole CO2 tank system- regulator, timer, tubing, fittings, tank purchase, and first fill. Refills are $20. One fill lasts me one full crop, or more in a 2k chamber.