Hmm... If we are removing CO2 at that rate from some place, then the concentration of CO2 in local atmosphere will drop. It will create a gradient so CO2 will start moving toward us, but what the maximum rate of CO2 diffusion? Wouldn't it impair our ability to miniaturize the ocean filled with diatoms as a CO2 absorber?

Though probably one can try to create an artificial wind, blowing CO2-free air away so CO2 could move quickly into the freed space.