Yeah, if I had an easy way to make nozzles. The only "easy" method I've seen is steel capillary tube.
I'm contemplating just switching to a micro-channel design by cutting the channels out of the base using a bandsaw or hacksaw instead of requiring a heap of drilling and dremeling. This design is $5 cheaper per block in terms of materials and will be easier to machine.
Again, the center inlet is optional so the design could be changed to a 2-barb design by simply not machining the center barb hole out of those two plates. The top is made from layers of .118" thick 2-inch wide polycarbonate sheets.