If we could agree on that we'd agree on simply simulating war, no need to actually send drones. But it's unlikely to happen for the same reason hero fights instead of army fights didn't happen like in the movies. Ultimately war is about a difference of opinion strong enough to not care about loss of life, so after a country would lose the simulation they'd just go onto the real war part anyway.

Actually simulated war does happen. Most of the Western world agreed to fight economic and culture wars since WW2 instead of actual killing.

That's not a simulated war. Trade war is just the first step of real war. People still die from a trade war, it's just from indirect causes.