Maybe....but
.......Most N roads in Europe have 80mph as long as its fine and not raining, In France they have dual speed limits one when the weather is bad and one for sunny days, I think (if my memory is correct) 80KPH when Raining and 110KPH when not.
As for Insurance compaines, it simple really if Admiral want to do this then simply don't go with them, when trade drops off they will soon alter their policy.
You can't blame speed on it's own for riders/drivers who loose control of their ride/drive on bends, as you say most will not be over the limit but still come off anyway due to other reasons, but everybody, especially the dogooders want to blame speed all the time.
If you want Zero accidents or injuries, dont ride or drive simple, it is a risk whenever we go out but a calculated one, we are not stupid and most of us don't want to crash or damged ourselves.
My main argument is with this topic is:
If you travel down the road at 35mph in a 30mph limit you are speeding and breaking the law, therefore in my opinion everybody who rides or drives speeds....
So what is the differrence (other than the speed itself) to going on the motorway at 85mph or as some have done over 100mph.
People come on websites with hollier than thou attitudes slagging off mainly bikers for speeding but happily jump in the car tomorrow and go 35-40mph in a 30mph limit.
As for informing your insurance company of a speed awareness course if your not convicted of anything you have nothing to inform them of. Insurance companies ask for "convictions or claims in the last five years pending or already done" they don't ask for speed awareness courses.