This is all why I suggested RM's, since they might not last the whole sprint race.
But as for your points, it's been pretty well proven that 9 times out of 10, pitting on lap 1 is fastest with RH's too.
So I see your point, and I agree with it 100%, yet there's no difference between the two options you mention in my eyes.
Using Nurb F as the same example, if someone can't run 8 laps on a set of RH's successfully,(we're talking GT300's) they're driving far too aggressively, hence my suggestion for RM's. Of course, even on RM's I think it would still say the same, so I don't see a problem running 2 sets, 1 set, whatever the case may be, because unless we're running RS, I'm going the distance.
Just ask Tony, Aderrrm, or TimeAttack what's best. (where I learned it)
Which is why I think a specific pit window will be neat.
It adds some neat strategy if we're mandating a lesser grade of tires, for example:
9 laps (10 counting formation lap)
Pit window: Race laps 3-6. You can start on RH and go to lap 6, or you can start on SS and pit early on 3.
2 strategies, more importantly, 2 strategies
every driver will consider, as opposed to only running RH's, where drivers better with tire wear will pit asap, every time. (unless they're in front one way or another, then maybe not.