I wouldn't expect any insurance policy to cover more than get you home.
With the right level of observation, it's only the unexpected sharp drops which present a real hazard. Although our local council have created speedhump central, and there are half a dozen within half a mile on our most direct route to the motorway.
The Ford V6 sump has a really peculiar shape, which would be a challenge to press from sheet steel. In my time with V8 MGBs, even after a few years, the heat from the down pipes blistered the paint on the sides of the sump, which then rusted, and eventually perforated. So steel pans are not without issues.
