Two questions about the 640d: xDrive useful? AHK/bicycle carrier possible or not?

Hello BMW-640 experts. I put my two questions together, hope that’s OK… At the beginning of next year I want to buy the BMW 640d Coupe, but I’m not sure if it’s going to be with xDrive or not. Since I often go skiing in the Alps in winter, that would certainly be a clear YES for xDrive. However, I usually travel on highways, federal and main roads, which are mostly well cleared. Asking at various BMW dealers goes totally apart, the One me nt in winter xDrive is almost indispensable, the other means “you absolutely don’t need” … depending on which 640 they just have in the assortment and want to get rid of… (so anyway my impression) How are your practical experiences? Are there clear criteria for a decision pro/contra xDrive? Test drives, especially in snow and icy conditions are planned for this winter. However, I would already be interested in “real” practical experiences with/without xDrive in advance. The second question g I don’t want to pull a trailer, but I can transport at least 2 bicycles. AHK would be the first choice because I already have a Thule carrier for AHK assembly. But I’m also satisfied with a BMW own carrier system… there are only two trekking wheels to fit on it. Therefore specifically asked: Can you build an AHK on a 640d (afterward)? Bzw. Are there bicycle carrier systems from BMW accessories that fit to a 640D (xDrive)? Thank you very much in advance!