The air lift powered stream flow idea will move water through the stream channel. However for natural streams to stay relatively "clean" or healthy they absolutely need periodic flushing or spates from flooding events to discharge lots of the accumulated materials that will want to collect in a rocky bottom areas of a stream including FA, plants, dead stuff, and lots of incoming terrestrial produced materials including silt, muck. Without periodic spates or scouring from strong flows and some needed good maintenance, even with some air lift powered flows, I foresee this long 500ft stream after several several years trending towards vegetation clogged, slower flowing and moving towards conditions in an oxbow. The shorter length of stream the better the flow from air lifts would help scour the stream sides and bottom areas especially any of those with depressions. Observe what happens in good quality trout streams when even small flooding events occur that flush excess materials out of the channel. It takes good strong flow to do that flushing.

In lakes successful walleye spawning occurs on windswept shorelines with 5"-12" cobble sized rocks. WE eggs are adhesive and fall into rock crevices where good oxygenated clean conditions occur and eggs survive to hatching and fry swim up. Crayfish and small fish among the rocky habitat eat a lot of the walleye eggs. Siltation keeps a lot of the eggs from surviving until hatch. Walleye can have egg hatching in streams with good water flow. I think that promoting successful walleye spawning in ponds can easily result in way too many stunted starving walleye just as it does with LMB and many other fish species. Successful reproduction and lots of recruitment are not always beneficial.