Congratulations on the new car. Very thorough and interesting read. I love reading about people's car history and how they found them to drive and own, very intriguing.
I would love to own the touring version of the M340i, but A) funds don't allow it and B) I would be worried that I would hate how it drives. I currently own an E91 330d 6MT, and it is an absolute blast to drive and chuck around. I'm not really a fan of the intrusive driving aids as it means there is more to go wrong and I would feel that I would become a lazy driver/pay less attention to road. However, the exhaust note of the B58 engine is divine and from what I have read, quite economical as well, although that isn't what you buy a car like that for.
I can't wait for a more in-depth review of the M340i from yourself. I'm sure that will make for an interesting read.
I wish you all the best with it