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The output from your B&M front is either AC or rectified AC (I think). You should be able check this by reversing the polarity of the wires to the rear light. If it works both ways, it's AC. If it works one way, it's rectified.
Good news if it's rectified, you can solder a capacitor across the two terminals into the rear light (polarity very important here) and it should be a rudimentary standlight in theory.If it's not rectified, it will be more work than it's worth to add a standlight to the rear light
yoshy
Annoying! Have a B+M line small rear light already but didn't use it as the rear rack I've got just won't really fit very well. Trying to get F+R lights mounted as stealthy as possible 1) better protection against knocks and assholes who smashed their bike into it at stands 2) thieves who rob lights, decide to smash them up if they can't rob them.
Will email Supernova, maybe they make a plug in super capacitor pack thing. Loathed to spend any more than already have on commuter