This is a site I use for plotting routes on my tours. Has all the great roads, highest, balcony rd's, details of the surfaces etc. A great resource for adding a little bit of excitement to your tour. https://www.dangerousroads.org/europe/france.html
I will refer back to this guide again! Though I checked locally and found Snake Pass. Perhaps I will have to wait until midnight in a snow storm to get the adrenaline factor! BTW. Snake Pass is a nice road, its just not extreme.
Ah but there are some great places listed too so rough with the smooth and all that. We're just going to have to do some research prior.