But would it do any better than a regular cross-drilled block?
To make it, one way to get it to 1 output would be to put another end cap on top of the first one, with a cover plate on it.
Run a center inlet extending to the bottom end cap chamber. Then drill 8 holes in the bottom of the top end cap at the edges of the circle between the fins so the water exits the bottom end cap and goes into the top end cap chamber. Then have the outlet barb going only through to the top end cap chamber. You could adjust the size of the 8 openings to balance the flow.
Probably easier and just as good to do a cross-drilled block, plus a cross-drilled block wouldn't eat up so much space
