This thread was and has been a fun read.
Just going to make one little point my Great Grandfather was a small ships man through and through who served in the RN pre-HMS Dreadnaught through to the end of WW2. What is interesting is looking at the balance of ships the RN had during this extended period and why.
Gun-boats (which he served on multiples of) were used in areas and situations where having a larger blue water vessel was detrimental to the mission outcomes desired.
As someone has already stated Gunboat diplomacy was real and a fact; often Britain would send a gunboat to wave the flag so to speak and irrespective of the opposition was expected to act and speak with authority against vessels of comparable or less size/capability.
I know for a fact he was on River Gunboats sailing down Asian (Pre-WW1) and later European (during WW1) rivers playing merry hell enemy lines of communication - which is one of the roles they were specifically designed for.
In response to the torpedo destroyer / gunboat idea taking on larger vessel whether it be a Galleon or whatever is not really something a captain of these vessels wanted to do unless there were no other options.
For example he torpedo destroyers of WW1 were already considered obsolete even by the Battle of Jutland yet both the RN & Imperial German deployed them - the original concept was to overwhelm enemy vessels with small fast moving vessels supposedly difficult to hit to deliver a knockout blow with torpedoes - a 10 inch shell doesn't actually have to hit one of these all it has to do is land near and the concussion/pressure wave will do the rest.
My GG always said they were nothing but an open coffin which if given the chance could damage or help sink a capital ship if a) it was distracted; b) already damaged or c) it's secondary armament was blind/dumb and stupid.
This coming from a man who often refused to serve on the big ships because he preferred the little guys. But like people who served on them they were not blind to the fragility of their vessels. They were not designed to go up against the big boys unless it was a full fleet action and even then they were usually held back due to the frailty of their design.
Yes Dilandu I totally agree with you that there would be more than enough volunteer Charisian sailors willing to serve on gunboat size vessels
(I know I'm agreeing with you).
People may ask why serve on one because they were the glory boys and you went into the attack against an enemy at full tilt; the adrenaline rush apparently was something to behold.
I agree with PeterZ and others that the KH VIIIs are more for dominating and projection of power than escort; they will have a demoralising effect on the enemy which is not to be sneezed at. Afterall remember the effect on moral of the CoGA fleet when the ICN used shells against them for the first time.
Anyway this is my 2 cents worth