Wow ChrisW, this thread was a lot of work and is very informative for sure!

So far, I have only two minor additions. First, the vignette is also sold for less than 7 Fr. (for example Migros Budget), and despite the difference in price always covers the same (2 mill. Fr. damages).

Second, a proposal for the cycle advocacy section: Other than IG Velo, they don't exclusively support cyclists, but they support the Veloland Schweiz maps and are politically active for bikers: Traffic Club Switzerland VCS/ATE.