OP can do whatever his choosing, I am with him that BMW is silly to get rid of spare space on newer models.
if you happen to take trip into remore area, you are SOL if the valve stem decided to pop, can't patch on the go like nail/screw. This happened to me once, BTW newer RFT are softer cause people complaints of harshness (one guy on 3-series forum needed new rim after 50-mile drive with flat RFT).

Honestly, I haven't heard compelling reason why BMW get rid the spare space (not the tires but the space in the trunk, so if someone wants to buy spare after market they can).