So your BWMs are so reliable that you need to know where to get them fixed when you're on holiday. I know, you know!
I wish I'd had this info when I had my 100GS.
Anyway, on one of my exploits down through France, my generator rotor packed in. I was directed to an independant BMW bloke in "Balazuc" about 20km south of Aubenas near the Ardeche. He fixed the problem on a Sunday morning. Saved my tour of Corsica, Sardinia & Sicily. Of course, true to form, my drive shaft was knackered when I got home.
Balazuc is at N 44.5 E 4.372.