All the superchargers I've seen are too big for a 1200, so two small ones might be difficult to find.

I have seen s/c with twin sidedraughts, not very common though. Search the 'Net and you might find some pics of V8s like this. The blower is on top of the engine and the carbs over the rocker covers.

Also for more interesting stuff and pics of the super charged 1200, see the Tech Section article Supercharging and Turbo-supercharging