Do aimbots react to spawned bots like they do to human players? If yes, spawning invisible bots in mid-air could help identifying cheaters aiming to the sky?
Aimbots could react to AI actors, but mostly don't react to invisible entities like spectators, you could probably spawn visible fake players (no way except for modifying the engine) in air and detect aimbotters from that. But you will most likely detect how they snap to different clients instead.
The only time I saw aimbots react to a "fake" player was with your loaded bots Ley0k. When I tested a while ago against spawned AI actors, dummy models, it didn't do anything. I also remember testing it with jv_bots and they didn't trigger it either.