Many threads on this already here, xbimmers.com and bimmerfest.com use the search and type in "spare tire". I'd help you but search results links sometimes don't work when posted in threads.
In brief, some do switch to non-RFs but usually for reasons like they prefer the ride/quality/performance. With 3rd row, not many spare stow options - other than the obvious. Many are using fill-a-flat type options. BMW makes a "mobility kit" with filler and compressor that uses latex. The BMW kit can be pricey (around $180) and the same basic kit (without the fancier case and gloves) can be purchased as the Conti Comfort Kit from Tirerack.com (another latex product) for about $80. Latex has been reported to damage TPMS. Slime makes two different types which both use a water soluble filler which is supposed to wash out without damage to TPMS (but TPMS will likely not function properly until washed out). the Slime "Safety" kits use a one step process where the filler gets pumped in with the air while their other kits are 2 step (remove valve core, put in filler, replace valve core and pump in air). here are some links:
Amazon.com: Slime Powerspair - 48 Piece Kit Tire Repair Kit: Automotive
Amazon.com: Slime 70005 Safety Spair Flat Tire Repair System: Automotive
Amazon.com: Slime 50051 Safety Spair Roadside Emergency Essential Kit: Automotive
From Slime web site:
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My vehicle has a TPMS device; can I use SLiME?
TPMS STATEMENT OF COMPATIBILITY
As leaders in the tire care and repair industry, Accessories Marketing, Incorporated (AMI), the manufacturers of SLiME Tire Sealant wish to address the mandate set forth in the Transportation Recall Enhancement, Accountability and Documentation (TREAD) Act, passed in the fall of 2000. In response to this mandate, the National Highway Traffic Safety Administration (NHTSA) established the Federal Motor Vehicle Safety Standard that requires the installation of Tire Pressure Monitoring Systems (TPMS) to all vehicles by September 1, 2007.
From our findings, and after significant dialog with the leading manufacturers of TPMS devices, SLiME Tire Sealant will not damage TPMS devices. We understand TPMS manufacturers have conducted extensive testing to ensure their sensors remain operational after exposure to any chemical fluids that might come into contact with the sensors. This includes after market products, such as SLiME Tire Sealant. AMI has also conducted independent testing, which supports and verifies SLiME Tire Sealant’s compatibility with TPMS devices.
Currently, there are two types of TPMS devices available: Direct and Indirect. SLiME Tire Sealant’s TPMS formulation is compatible with all TPMS systems. However, it is important to note that once installed, Slime Tire Sealant may come in contact with the sensor in a way that renders the sensor TEMPORARILY inoperable until it is properly cleaned, inspected and re-installed by a tire care professional.
Because SLiME is a water soluble flat repair treatment, it is easily removed from the tire with water. At the time the affected tire is inspected by a tire care professional, they should clean the sealant from the tire, prepare the area and repair with a Rubber Manufacturer’s Association (RMA) approved patch/plug. The TPMS device should also be cleaned off with water to remove any sealant which may have come into contact with the device. Do not use any fine objects to ream and clean the small pressure sensor opening as it may damage the electronics. After the repaired tire is replaced and inflated the TPMS system will resume operating as normal.
Please note that SLiME is recommended as a REPAIR for all Over the Road (OTR) applications.
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Tire Rack : Continental
From the web site:
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Use of this product on direct TPMS vehicles could also result in damage to the tire pressure sensor inside the wheel. Please contact your sales specialist at Tire Rack for more information.
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Amazon.com: BMW Genuine Mobility Kit - Tire Repair Kit: Automotive