A newer generation of CZ-550 is due to come out with a synthetic stock. The version coming out is based on the Varmint(heavy barrel), no standard barrel in sight. Call H-S Precision they should be able to help you out with aftermarket stocks.
Accuracy is not comprimised by cutting barrel off 3'', this will only bring you less velocity, but in a vehicle or heavy brush area will handle much more easily. You'll be left with putting your front sight on the new cut barrel & have your muzzle recrowned.