Hmm... you "keep RP"? Are you implying that I don't?
Anyways, the solarises can be switched out for any basic gun turret, such as Outcast turrets.
And yes, corsair gunboats are relatively easy, as most of the ones I encounter have no clue how to fly them...
And I've beaten two well-flown bombers with that setup, and they had Coladas as well...
Weapon groups are a -must-, the cerb will mess up your aim against bombers unless you turn it off.
EDIT: You can mount regular mortars on destroyers? I thought they were class 10?