Thanks for posting; that jogged a few memories - we did that Susten/Furka/Grimsel circuit a few years back, but clockwise, on my old Electraglide. A lovely ride initially, but roadworks held us up at Andermatt & then the weather deserted us over the Grimsel when rain turned to sleet & we were just glad to get back to the hotel at Meiringen (made famous in Sherlock Holmes storylines) safely. Such is a bikers life in the Alps - 4 seasons in one day.
The following year we transited back from a very hot (read way too hot 40c +) Italy on my FJR & the mountains were a welcome respite. We stayed at Oberwald, a fascinating old village (Hotel Alpenhof), before riding the Grimsel on our way north to Baden-Baden via the B500 in excellent conditions all the way.