What's wrong with [B]Ra6[/B]?
If Bd2, then 49 Ke2 and they can't save both pawns. If 49...Nc5, Ra7 check, exchange the bishops, worse for black. Here we still can play 49 Re6+ (just a delay of one move) and then attack both pieces with Rd6 after he moves the king.
If OTOH 48...Nc5 (as Ne5+ is more like helping us to move the king to e2, preliminary, no other check possible then, bad for black) then 49 Ra7+ then later Bc2 or Bd1, we save both and they must move either the bishop or the knight, having both in a line, so we reach our goal (of making them to have both pieces misplaced, as you said) and still have the move. I didn't take this very deep, but I feel we still can get a pawn for free.
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