I bought some Bike-It extenders for £8.99 from a Kwacker dealer, they look very similar to these
You have to be careful with clearance clarence as they come close to parts of the handgrip assemblies
But definitely do-able
And got some Aprilia look-a-like mirrors from out East somewhere (ebay?) for £11.99
A bit plastic looking but the glass is good and they work well and look good
And bloody good value as is everything that I have bought from out East
The only downside is the viewing area is smaller and can be a bit of pain to get right
I use my mirrors all the time
I have never had any rubbish from that part of the globe, all very good quality and well cheap
Most of the european stuff has been quite expensive and rusts within a year, (eg Givi and Motech)
Maybe I have been lucky with the former and unlucky with the latter
If you would like some photos let me know and I will try to find the mirrors for you if interested
As to the buffeting, never had a problem at all with this bike, but the Tiger 800XT had it in bucketloads so got a Givi Airflow (problem solved)