you'll have to erect a "tent" around the work. Also Id suggest using something like corn cobs mixed with a nutshell grit. (Sand grit can actually carve the bricks and you may not like what you get.
If the paint is a water base, there are surfactants that can cut through but they take time to work (like several days of keeping moist), oil based paints may need torching and then a solvent like methylene chloride. you still may not get it all off without blasting.
We created a large 4 season porch room along the back portion of the farm house and it had about 150 years of white paint. We removed that with nut shell blasting and actually, the little bit of remaining paint gave the whole wall a neat kind of colonial look.