Teach her how to drive the stick and do it!
No question IMO, 1265 made, and its not just plain silver, and look at those wheels! Ahhhh E39 M-sport manual, I don't think its even a question, you know E39s better than most man!
That car needs to be your DD, sell your other E39 like you said. Your wife already drives the newest vehicle in the house so if she ever needs a "backup" she will have to row her own gears
DO IT!