Some corresponding questions to the OP’s (Homeowner):
I think it might be easier to boil this down to a few questions:
2. Putting aside the law for a moment, under Halacha, what gives you the right to disturb (with your illegal curb-cut removing a public parking spot) your fellow Jew by interfering with his municipal right to public parking? Again, do you have a heter?
3. Again, back to Halacha, knowing that the Department of Buildings who summons your illegal driveway is likely going to be a gentile, how do you reconcile committing Chilul Hashem by openly breaking the law especially if you have a mezuza on your front door or other Jewish articles visible in front of your home?