... might provide some advantage to your conventional gear, but I don't think that is the best approach.

From what you have described, at least the way I get it, I would be using a rather long distance downstream presentation. Cast a good distance above where you think the fish is / fishies are, and feed out a decent amount of line dead drifting the fly but without much slack.

And instead of a dry fly, you might want to do this with either a soft hackle wet fly, or a streamer, if there are baitfish in the system. With the soft hackle you can cast to the center and let it swing back to the near bank. Since you can see the V of the trout's wake, it seems they are in shallow water, so the soft hackle can ride pretty close to the surface.

With the streamer, you can cast to the opposite bank and swing / strip it across the entire creek or you could just feed out line and let the current take it below the fish's lie on the near side, then strip it back up past the fish.

Sounds like an interesting challenge. Good luck with it.

John