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I don't think it would be feasible. The fuel coming out of the IP is at a very high pressure, and I don't know if the return lines (mainly rubber) could handle the direct pressure. In addition, short of custom fuel lines, I don't think you could put a valve anywhere without changing the timing. Interesting idea, though.
BTW, on a gas engine, I believe that if you pulled wires so that the opposite cylinders were firing (i.e. make a V-8 into a 4 cylinder where the cylinders were still firing every 180° of the crank), that would work. In fact, I think that someone has a V-8 gas engine that's made to do exactly that. However, I don't think that's feasible on an odd-number cylinder engine...i.e. it would be doable on a V-6 or a V-8 but not on a 5 cylinder or a 3 cylinder.
Also, extended idling for a diesel isn't all that healthy; you'd be getting unburnt fuel past the rings and into the oil, making it necessary to change the oil more often.
Just my $.02...good luck! Do you have a block heater or an oil heater?
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