It is a punitive mechanics, as OOB G40 instead of a bonus mechanics develop previously on this actual thread.
It is yet to be play-test to see if this can be balanced somehow.
This new sequence with modified SZs is inspired by the quoted post.
Now, I can provide a revised for Redesigned National Convoy Disruption House rule for 1942.2.
First thing, the Convoy SZ is to be identify with Power’s Convoy Marker on map.
All Convoy SZs worth 3 IPCs and are bordering at least 1 TT or have an island group in it. These TTs can worth 0 IPC to many IPCs, this doesn’t change the 3 IPCs Convoy SZ basis.
Here is 1942.2 modified map (for more action into Pacific Theatre) Convoy SZs I would implement (some such as SZs 2, 3, 34, 45, 53, 57 can be considered as Allied lend-lease shipping SZs coming from either UK or US toward Russia or Australia) :
Soviet Union 25 IPCs
3 SZs x 3 IPCs = 9 IPCs max.
SZ 4 (Karelia and Archangel)
SZ 34 (Egypt, Saudi Arabia, Persia),
SZ 63 (Soviet Far East)
United Kingdom 40 IPCs
10-12 SZs x 3 IPCs = 30-36 IPCs max.
SZ 2 (Greenland)
SZs 3 (Iceland), 7 (Northern UK), 8 (Southern UK),
SZs 10 (Eastern Canada), 13 (Gibraltar), 23 (West Africa),
35 (India), 40 (New Zealand), 45 (North Eastern Australia)
If captured by Allies: 37 (East Indies), 44 (Solomon Islands).
United States 50 IPCs
9 SZs x 3 IPCs = 27 IPCs max.
SZs 2 (Greenland), 11 (US East Coast), 18 (Caribbean), 22 (Brazil),
SZs 53 (Hawaii), 55 (Mexico West Coast), 56 (US West Coast),
SZs 57 (Midway), 65 (Alaska/Western Canada)
Germany 45 IPCs
2 SZs x 3 IPCs = 6 IPCs max.
SZ 5 (Baltic)
SZ 15 (Italy)
Japan 35 IPCs
6 SZs x 3 IPCs = 18 IPCs max.
SZs 36 (Malaya), 47 (Borneo),
SZs 48 (Philippines), 60 (Japan), 61 (Costal China), 62 (Korea)
An important thing to note :
lf at least 1 territory bordering (or the Island group within) the Convoy SZ is taken from his original owner and the Convoy SZ belong to the same owner, then this Convoy SZ is deactivated and can no longer be raided by enemy’s of the original Convoy SZ owner’s which have his control marker in this Convoy SZ.
When such Convoy SZ is deactivated, simply place a Nation Control Marker from enemy power onto it.
Only Submarine can raid Convoy SZ.
During Phase 1 of a Power’s turn, renamed : Convoy disruption and damage repair on IC and 2 hits units.
Each enemy’s Submarine present in a Convoy SZ of the Power’s turn makes a Convoy raid (Convoy Disruption).
Even if there is warships (including Destroyers) in Convoy SZ, Submarine can still make such raid. Once the raid is done, Submarines stay in raided SZ.
Each Submarine can make up to 3 IPCs damage, by rolling 1D6 divided by 2: 1-2 = 1, 3-4 = 2, 5-6 IPCs = 3 IPC damage.
So a single Sub always does at least 2 IPCs damage on average.
There is no defense roll and Destroyer cannot do anything about it.
It is up to the Convoy SZ owner’s to send Destroyers (and more) during his turn to retaliate and sink Subs in combat phase.
Damage are immediately remove from Convoy owner’s hands, never more than 3 IPCs per SZ.
*Exception: when there is two Convoy markers (Greenland SZ 2).
Such a raid is still up to 3 IPCs per Power’s turn, but can reach up to 6 IPCs, when UK’s and US’s damage are summed up. *
Below, you get the picture of a modified 1942.2 map marked with these SZs.