I saw this post a few days ago an wondered if it would be possible. As ArdsAbarthist I also thought about tyre retention, I seem to remember they lock into a different profile in the rim.
I did a bit of digging and found the following.
Fitting Run Flat to an older vehicle ('retro fitting')
If you are considering changing to run flat tyres on a vehicle that was previously fitted with 'normal' tyres, then there are several points to consider:
1.Tyre Pressure Monitoring System
Run Flat TPMS Run flats must only be installed on a car which has TPMS/tyre pressure monitoring system. TPMS alerts the driver to a puncture so they are aware that they have a limited time to replace their tyre, and so they drive within the limits of their deflated tyre
2.Vehicle Suspension
You should also note that you may need some changes made to your vehicle's suspension. Because of their stiffer construction, run flat tyres contribute to a vehicle's suspension when fitted as original equipment.
I think it would be an expensive mistake if you fitted them and they did not work with your suspension set up. Also if you did get a puncture you would have to scrap the tyre as they are not repairable.
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