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If you change the crankshaft you would have to change pistons and/or rods also to maintain a proper compression ratio. You`d basically be rebuilding the bottom end.
I`m not sure what side effects would result from going to a radically over-square (large bore, short stroke) configuration. Fuel/ignition might need to be retuned to realize any gains in efficiency. (more spark advance?)
If you continue to use the existing intake then it would still be tuned for the same power level (and would be suboptimal for the low-rpm or low-load conditions that I assume you are favoring). In the Italian market, BMW sold (for tax reasons) a destroked (2.0L) version of the 2.3L e30 M3. It lost some torque but peak power remained pretty close, while moving to a higher RPM (192 at 6900, originally 200 at 6750)
If you feel the displacement is too large, how about going to taller gearing?
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