Maybe it would be possible if you can circumvent the human sensory organs and directly feed the signal to higher brain areas. The delays in sensory modalities are anyway very diverse and not at all synchronously processed in real-time. Even within the same modality the signal is disintegrated in the brain. For example an image from the retina is processed with completely different delays in the ventral and dorsal stream. The ventral stream has latencies of several 100 ms [1]. It is still an open question in neuroscience how these different latencies are combined in higher areas in a way that they are perceived as synchronous.
So even if you are in a conversation with people directly in front of you, you do not actually have a real-time system. It takes roughly 400 ms until the image of a face of a person standing in front of you is processed in the ventral stream and is actually detected. On the other hand there is the auditory modality which is much more sensitive to latencies. But in the end the brain gives you the illusion that anything you perceive is actually real-time, although it is not. So if your brain decides to give a motor signal to actually press a piano key, then only many 100 ms later the actual sound will arrive. The perceptible latency of hearing a sound is actually only because the brain itself takes into account the delays in itself.
So in the end it comes down to trick the brain into believing something is real-time. This is for example done in multiplayer ego-shooters where the motions of other players are actually interpolated into the future and later on corrected if the other player actually changed their last motion command.
[1] Barragan-Jason G, Besson G, Ceccaldi M and Barbeau EJ (2013) Fast and famous: looking for the fastest speed at which a face can be recognized. Front. Psychol. 4:100. doi: 10.3389/fpsyg.2013.00100
So even if you are in a conversation with people directly in front of you, you do not actually have a real-time system. It takes roughly 400 ms until the image of a face of a person standing in front of you is processed in the ventral stream and is actually detected. On the other hand there is the auditory modality which is much more sensitive to latencies. But in the end the brain gives you the illusion that anything you perceive is actually real-time, although it is not. So if your brain decides to give a motor signal to actually press a piano key, then only many 100 ms later the actual sound will arrive. The perceptible latency of hearing a sound is actually only because the brain itself takes into account the delays in itself.
So in the end it comes down to trick the brain into believing something is real-time. This is for example done in multiplayer ego-shooters where the motions of other players are actually interpolated into the future and later on corrected if the other player actually changed their last motion command.
[1] Barragan-Jason G, Besson G, Ceccaldi M and Barbeau EJ (2013) Fast and famous: looking for the fastest speed at which a face can be recognized. Front. Psychol. 4:100. doi: 10.3389/fpsyg.2013.00100