A couple thoughts for a B-52-based patrol bomber:
1) The standard heavy bomb rack for the underwing pylons could probably carry air-launched derivatives of full-sized torpedoes, not your standard lightweight air-launched torpedoes.
2) Going to add a MAD boom or deployable mad "bomb"? I like the second option as it causes less blockage for your rear turret.
3) Do you intend to add a sonobuoy launch system and, if so, where? For that matter, will it be crew-served or automatic? The former constrains location considerably.
4) For anti-surface warfare, perhaps anti-shipping versions of the Rascal on the wing pylons? Or a similar derivative of the Hound Dog?
Just a few thoughts as to what might be needed.