I think(?) you might be able to disrupt the LMB spawn.
Since you have lots of water flow through, you could perhaps draw down the pond by as much as 5' during the height of the bass spawn. That could potentially wipe out a lot of bass nests.
Don't know in your pond how many LMB would spawn deeper than 5', or how many spawn a little early or a little late and would NOT be disrupted by your timed draw down.
I think it would be very difficult to disrupt the BG spawn. After the water gets warm enough for them, they will pull off several spawns throughout the late spring and summer. Even if you tried to destroy all of their preferred spawning habitat, I think they would still pull off some spawns. (That is why they are a great forage fish in most situations!)
I think the best thing for the LMB would be to catch as many as possible. There should be some times of the year with certain baits/lures that you would be catching mostly bass.
