Yep, can be done, there are any number of BB30 - 24mm converters out there - Praxis Works, Wheels Mfg, FSA, etc, etc. I only recently installed a pair of Wheels Mfg converters - they are very simple to install, press into the BB30 bearings and the Shimano 24mm crankset spindle pushes through them. I've found them to be a very good alternative and the DA7900 cranks I installed shift better than the FSA SL-K Light ones I took off. The only reason I went this way was because the pedal nut in the NDS crank arm on the FSA cranks came loose and cannot be repaired. Bit of a bugger really.

cheers