take it out tie a rope to it and drag it down the road for few miles, if stopped say well it WAS TIED in the boot officer honest, or,------- I was running in my new brakes
9" grinder with grinding wheels and some patience. And a ruler to check it's flat.
I'd probably keep one dip in and get the other half flat, giving you the best of both.
The inlaws have a big 4cwt anvil on their patio, It came out of the old Benfleet forge next to the Hoy & Helmet pub in the late 50's when it closed down. It had been in use there for centuries & has at a 1/2" dip in it plus a gas axe cut on one side. My name is on it & i shall leave it as it is.