Increasing LOS for units does not make intuitive sense. Delaying the information by a few seconds would make sense, but is maybe not obvious for all players.
I think it would make some sense. Give it a lighter grey than the FOW, but still not full color like revealed FOW. But if I'm understanding you correctly, it would be like some kind of "delay", as in the units you see are where they were a few seconds ago or something?
That would be cute, like the airplane pilot is relaying what they saw in the air to the units on the ground. Would be a bit of a mindfuck and I would imagine it would require some extra calculations or something but possible to do I would assume.