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Diesels already run quite lean, so even a relatively small amount of propane (or CNG which I am more used to) won't be so bad even if you tune the engine to inject fewer Diesel while running on propane to keep the standard AFR. I would also rather resort to a liquid-phase sequential injection, in order to not only decrease the amount of wasted propane during valve overlap but also to increase its cooling effect on the intake charge.
I'm more used to CNG anyway, which is quite simpler as it's harder to knock, and recently I have even seen a Mercedes-Benz semi-truck with CNG enhancement which AFAIK has not been so unusual at all in some parts of Brazil.
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