That’s actually a pretty neat idea, but the trick is getting the timing right. The frequency shift you’re talking about is really tiny unless the source is moving fast enough—like a plane or a train. You could simulate it with a synth that ramps the pitch as the track “approaches” and “recedes,” but you’d have to sync that ramp to the dance beat. It’s doable if you’re willing to spend time tweaking the envelope and maybe automating the delay too. If you can pull it off, it would give the crowd a fresh, almost living groove. Give it a shot, but don’t expect it to happen automatically.