Its's enough with 2*quad packs harpoon launcher, 1 76 mm gun, but for a ship this size a 56 mm is best, and it would function best in both role, space for more ammunition, due to size of the ammunition, etc.
carrying thousand weapons system, doesn't make a war-ship powerful, that it can use it to it full potential without problem make a warship powerful.
closest I could find as an example:
Braunschweig class corvette, 80 meter long
another example is an Norwegian Skjold class (although it's used to hunt and kill other surface ships, but can transport special forces):
or a the Swedish corvette: