In "Kriegsmarine: Naval Campaigns" by Wargame Design Studios (RIP John Tiller) the allied player is simply not allowed to command his units at all until either an axis unit is spotted or an allied unit is hit. It's a simple solution, but of course you've already addressed how there'd have to be restrictions in place on how the player's unit can spot things, plus it wouldn't be very fun to have nothing to do.
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