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@M_V
Absolutely 100% WILL NOT WORK.
Take a piece of paper and draw a simple representation of a freewheel like this:
or print mine
Now, hold your paper up so that the drawing is on the right hand side of the paper, representing a "normal" right hand drive freewheel and notice how the outer bit with the teeth which is driven by the chain engages the pawls on the inner part and drives the hub/wheel.
Now flip the paper around to represent the left hand freewheel and you will notice that the inner part with the pawls will drive the outer part with the teeth and in turn the chain and cranks. Neither side of this system will ever freewheel, when you pedal forward on the right side crank/chainring you drive the right side rear cog which turns the hub which turns the left side rear cog wich turns the left side crank. Unless the same gears are ran on both sides as soon as you move the bike the two cranks and the two sides of your hub will be trying to move at different speeds.
Sorry if iv repeated myself there but its hard to explain.