KK, thank you for the offer, I am still not sure whether grab rail would look good or not, I think I will wait until I see some other bikes in Belgium.
Yesterday I bought on eBay auction pannier rails for W650/W800 for a fair price, so I will let you know how/if they fit.
And last but not least, yesterday I finally had some time for riding and after fitting new air filter, the difference in surprisingly noticeable. It feels like George has more power, runs better and also fuel consumption is 1 liter/100km lower! I guess the old filter was really bad, so I am very happy with the new one 🙂