I post Atlantic convoy lines here, if there are any errors please correct me. Our trade is broken this cannot be done right in game.
CW BP from India to USSR
22 total factories
routes for resources to factories
17 factories in UK
2 res from UK
2 res from FF Africa (via Central Atlantic/CSV and North Atlantic)
1 res from Portugal (via CSV / North Atlantic)
3 res from CW Africa (via CSV and North Atlantic)
5+1 res from Canada (via East Coast and North Atlantic)
2 res from South America (via Central and North Atlantic)
1 oil res from Trinidad (via Central and North Atlantic)
Convoys for resources in Atlantic
FG 2 1 3 6 2 1 = 15
USEC 6
NA 2 1 3 6 2 1 = 15
CSV 1 1 1 = 3
CA 1 3 2 = 6
CVB 1 3 =4
In Addition following CPs are needed
1 BP from France to US
West Med, CSV, CA, USEC
2 BPs from US to CW
USEC, NA, FG
One extra to each sea zone to get oil saved to UK
USEC, NA, FG
According to my calculations at this points Caribbean Sea needs 9 CPs
3 for CW oil from Venezuela
3 for US oil from Venezuela
2 for US->FF BPs
1 for US res to Brazil
extra CPs will return to base. Let me know if there seems to errors in my calculations.

If your attack is going really well, it's an ambush.
-Murphy's war law