The limiting factor is the size of the sparger that goes into your tank. It must be designed to fit the tank and to move between tanks. Or, you need multiple spargers, one for each tank.
Would it be reasonable to only introduce burst agitiation into the developer tank for uniformity? Then simply use regular hand agitiation techniques for the remaining solutions? If so, then there might be a simpler path open for some type of a DIY solution. This is something I've also mulled over for my 6-hanger, 1-gallon, 4-tank system.
"Hate is an adolescent term used to stop discussion with people you disagree with. You can do better than that."
—'blanksy', December 13, 2013