If a scout patrol can be armed with rockets, it can destroy a dreadnought. The total destruction radius of a 50Mt bomb was 35km. Multiple times the size of one Star Dreadnought. And that was 1961, barbarian technology.
If it cant - loadup scout with stuff, plot suicide course, eject pilot, same result. The Empire sure had nuclear tech right? Its Hollywood man, dont put more thought into it than needed. lal/