I haven't done a flapless TO in the SIM, but did do a few deployed reversers. The first being in my initial. Let me tell you. Close to the ground it is hell to get out of. You will get an uncommanded yaw like you have never seen. It is almost to the point of saying that this scenario is one instance where priorities change. Memory items, aviate, navigate
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It is imperative to remedy that situation. 100% thrust on one side and -60% on the other absolutely kills you. However an unlocked reverser that close to the ground should have been seen by the investigators on the video. If the engine does not surge you will see two huge shiny slabs on one side and in many cases soot shooting from the reverser buckets upwards and downwards. I think the reverser was a last ditch attempt to stop the plane...........ASAP.