True, but why give up what content there is. You know better than I how to do this, but if it is doable, I would at least consider figuring out how. Since the three speakers are identical, why not just reduce the level by 1/3 and send it to all speakers? Or, since it is non-direction, send the whole lfe to just 1.
Definitely a small effect, but if possible I would give it a try.