Well, after a bit of searching, this can't be done exactly as described since as far as I can tell as the game doesn't differentiate between contacts based on what is detecting them. For those who are interested in a quick and dirty fix, however, I replaced all of the *_shp.dds files in Data/Sea with empty transparent placeholders. This will result in no visible contacts at a certain map zoom level (when the scale goes from NM to yards), and also no hydrophone contact lines if you do the same to their respective files in menu/gui (ContLine and DashLine.dds). So if you're ever in a situation without your radar, just go to that map zoom level and you won't see any contacts popping up. 99% of the time, radar is unavailable due to submergence, and if you're moving in for an attack with the periscope causing them to appear on the map as visual contacts, you should be zoomed in to that level anyways as the distances get shorter and shorter between you and the target.
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