You can use the recirculating Rio 600 or 800 modifications and they have a 6 blade imepller, then you can drill or melt tiny holes in each blade.

I have a plan for doing this for the in line version, as well as having an in tank Rio for this as well to hit the spots I want mist that the normal filter outflow does not target.

When folks come over, or a photo shoot, I can remove those in tank items.
This gives me a couple of redundancy levels.

In line, you need a pump that does not leak, the suction side will have little if any back pressure, so making a loop, much like the venturi mazzei loop, you add this to it.

You do not need a large pump for that and it'll work in line with most any system, or size.

Then you melt the holes into the impellers.

Regards,
Tom Barr