2 ) Learn the lessons of the past A) Institute a convoy system
Already been done from what I've read.
B) Organise shipping control so you know exactly who is where at all times
difficult to impossible to do. The big merchant vessels are not a problem but private vessels, as well as fishing vessels, and smaller tramp steamers are a bit of a problem. As is the expanded area over which the pirates are operating.
C) put hunting groups together and start chasing them
You don't need a "group" but with the catch and release policy chasing them down is rather futile.
D) construct a "stone aircraft carrier" on Socotra island
F)All big merchant ships to carry marines ( 20 each ought to do it )
A squad would probably be enough but whoose marines? And who pays for them?
G)All merchant ships to be fitted with the anti-pirate gear as used in the china sea in the 1920s ( a bit of barbed wire on the rails , and a fire hose or two is just pathetic ) Kevlar armour the bridge and the vital areas .
Given the number of vessels you are talking about a huge expense.