Anyone found a dealership or independent doing offers for a full set?
Whilst I see what you are saying, a lot of aftermarket wheels are TUV approved so if you get a set like this the chances of them buckling or going wrong is about as much as it is with the OE Ronal wheels you have. Remember it's not so long ago that a certain B5 RS4 had soft wheels and masses of them were replaced.
That may be but your line of thought but as a rarity on this occassion it is flawed so to give someone else that advice and then ignore another member's advice and research, really?
There are wheel manufacturers out there that manufacture stronger wheels than Audi and their suppliers. Don't be fooled into thinking OEM wheels are the last thing in safety, they are as good as some reputable wheel manufacturers out there and occasionally worse.
HRE, MAM, MTM, Sportec, BBS are but to name a few that are TUV approved, the same rating Audi use. My winter wheels are Ronal, same os OEM. And believe me I do my research on any part I put on the car to ensure it is as good if not better than OEM otherwise there is little point.