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Is there such a thing as a fixed/free double sprocket à la White Industries? That'd sort it
Or could you do something silly (more my style) and have a double 6-bolt hub, then have two rotors with the sprockets bolted outside the rotors (with spacers). Find/buy/manufacture a 6-bolt to freewheel adapter on one side. Flip the wheel to swap from fixed to free. Braking and drivetrain may be compromised and clearance and chainline would be an issue...
Something like this:
frankenbike
It turns out that it wasn't a great idea; if you're switching from fixed to single free there's a pretty good chance you'll also want to change gear at least, and maybe tyres too. Having two pairs of wheels is a better plan.