There is no way that BMW is going to only use DWB suspension only on non sports. DWB suspension is not something that you can get rid of easily. It is part of the design of the entire vehicle. You cant just go from DWB to struts and vice versu. It doesnt work like that. It would basically be a differently designed vehicle. Also the hitch will come from under the bumper for sure. No door or opening is necessary.
As far as run flats it is the only option but if you dont order the 3 row seats you do get a space saver spare tire on all X5s

__________________
Dinan M3

2006 X5 4.4i Sport Current Vehicle
2006 CLS 55 AMG Current Vehicle
2010 FORD F-450 King Ranch Current Vehicle
2012 GL 550 Current Vehicle

1999 M3 Dinan S3 SOLD
2001 M3 Dinan S2 SOLD
2002 M5 SOLD
2004 X5 4.4i sport SOLD
2007 335 XI Lease ended
2009 E92 M3 SOLD