I know a little about wheel installs, lol, slip ring is dependent on current of course & also the steering wheel control module, but if you get vcds yourself anyway it pays for itself in 1st use, you could get a wheel for maybe £400 or less, genuine vcds for £230ish & maybe new parts £170-180, so potentialy save few hundred plus get full vcds for future work, 1k is rich, but check on the Bay for cheap parts & maybe get someone local to you to code for less than vcds purchase which saves you even more, I know someone up your way if you do the donkey work he'd code for you for a small cost.
I was referring to the actual wheel purchase being cheaper than rns-e, thus the rns-e has all the extra costs aswell like quadlock adaptor convertor, diversity antenna adapter maybe, gps antenna, dvd's, double din, etc etc I could go on, thus costing a fair bit anyway as the wheel would, so if you look at it like for like purchases then the Flat Bottomed MFSW is less money without additional parts, if you get me.
Pity its not a B7 as they all have same slip ring & SWCM, oh well audi for you, I noticed from elsa/etka they seem to be adopting single use item so it is just a coding change for a feature aswell as maybe an additional module as checked a module other day & was surprised to see only one available where as prior ones had about 10 different