Don't be picking at your B-2. Is just fine.
Could you transform it into KB-2 refueling a B-10 (B-17, B-24) ? After all this is BTS.....
I figure a KB-2 would have either a flying boom or a hose and drogue unit (either "stealthed" by material choices and, in the case of the boom, shaping) operating out of the port weapons bay (starboard one could carry an auxiliary fuel tank for extended range or, in this case, refueling capacity). I would go for a hose and drogue unit, myself, as it would be a simpler system to develop and install (and simpler generally means "less likely to glitch up").
Another option for the B-2 would be a RB-2 with the port weapons bay replaced by a reconnaisance module where the projecting part resembles the front halves of two TSSAM's fitted back to back. This would accomodate both photo and SLAR reconnaisance gear.