I think the pedes won't do well. I tested a privately made block with a fairly large open desing that didnt do well. Seems like when the nozzle plate is too open with an intricate open design, there is only movement at the perimeter of the opening pattern. Water at the center of those nozzle types is essentially sitting still.
Actually I think the single slot would do well if radiused. Its pretty surprising how much a little radius can do at inlet losses like that. In pipe design you can see upwards of a 30% or more improvement..so if the nozzle plate itself is causing a majority of the pressure drop, you should see a worthwhile gain trying the dremel radius thing..





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