Since you want to use the 10H’s race rules and you allow us to discuss it, here are a couples of thoughts:
First I think endurance races above 6h should not use SC as it makes creative strategies pointless, no short stints to try building a gap to allow for the extra pit stop and no long stints to try saving one.. always the boring 1h stints…
Second, using time penalty during the race and SC is hash on the drivers, say that you have 10sec added time penalty and manage to build that gap to win the race, then 10min before the end of the race SC comes out, your effort is reduced to nothing. And also you are resulted to fight time as you have passed the driver 10sec before. As driver I prefer to take a longer DT penalty and get on with my race.
Also when you use multiclass or not and the SC is out, what is the point of letting everyone unlap themselves… In the 10h we’ve seen both GT2 and GT3 being allowed to do so and I couldn’t understand what was the point, without talking about the time it takes to do it…
SC should not be used as an instrument to keep the livestream watchers happy!
My 2 cents…