Can't you do this already by just taking up a boat's slot? i.e. U564 is BDU. Just sits submerged at 15m and directs / plots everyone else? You'd only need two on the boat - one Radio and one Nav - the Nav being the one in charge of the pack.
Just having 3 boats out there to engage a convoy is plenty.
If you want to try this out, I'd be game.
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