Speaking about weird escorts, see HX 79 ... they had a sub as escort
There are several HK groups patrolling, but to actually meet them is something based on luck. Is also very possible that none will notice these new convoys I added as the ocean is huge and they use very random routes. But if you will track the reports on map, that may help to track them down.
Anyway, this is hard. Worked almost all day and I managed to add only half from the list. I think this mod will take another month of hard work to get somewhere.