Would a River-class variant with several 76 mm guns be a viable anti-gunboat ship?
Short answerThe preferred outfit uses a 57 mm gun, two missile-equipped 30 mm mounts, close-in defense, and UAV or USV facilities; several 76 mm guns are more than the mission needs.
NotesThe proposed layered outfit combines a 57 mm gun, two 30 mm mounts with missiles, and a close-in weapon aft. A helicopter UAV hangar and facilities for small uncrewed surface craft would extend surveillance and engagement beyond the ship itself. Multiple responsive channels matter when numerous fast boats may approach from different directions. Several 76 mm guns would consume weight and space without matching this distributed anti-swarm concept as well. The 57 mm gun could also engage some light shore positions, though it is not presented as a heavy bombardment weapon.