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@M_V
Glad i saved you the effort/expense and btw your animation is 100 x better than my shitty paint drawing.
I was thinking about this a bit more though and came up with a few things, Would it be possible to make a double sided freecoaster hub? Freecoasters are a clutch mechanism rather than a ratchet and they eliminate the problem of the wheel/freewheel centre driving the chain and cranks. Primarily used for bmx stunts so that you can roll back with the cranks held still but seeing as the left hand drivetrain is effectively running in reverse it might work.
Also, i remember seeing an old school bmx freewheel on ebay that had a button on it which turned it from a standard freewheel into a freecoaster somehow. Or possibly it just shut off the ratchet mechanism so that itd coast but you would get no drive from it.
I think the button was on the face of the freewheel where itd normally carry the branding ie dicta acs etc. No idea how it worked but if it could be rigged up to have the button activated via cable from a handlebar mounted lever etc.
Or just run two of them in freecoaster mode on either side of a flip flop hub thus creating the above mentioned dual sided coaster.