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Time to find out if you can wire a RedEye to a Edelux II...
I imagine you can, although you may need a current-limiting resistor like in the Sinewave Beacon instructions - it would depend how the Edelux drives the rear light and what its output is rated to. If it's capable of driving the Redeye at full current you may find that it diverts current away from the Edelux so the front light is dimmer. If you do need to use a current-limiting resistor then the Redeye will be dimmer than normal, and some of the power produced by the hub dynamo will end up being wasted heating up the resistor.
Part of the problem may just be that these are notoriously extremely bright. I don't think any of the tiny little dyno rear lights, SON or otherwise will come close