I don't think I'm nearly fast enough to do the proper Raid in the time limit allowed, but I'd like to do that general sort of route in a more sensible sort of time frame
There are 2 versions of the "proper" raid. The sportif which allows 100 hours and goes over 18 cols, and the cyclo-touriste version that allows 10 days and goes over 28 cols. The distance for each is pretty much the same.
The tourist version tends to get forgotten because I suppose so many people ride the supported rides that use the sportif. It does however make a very nice tour, although no good to you because you have specified supported.
The tourist doesn't just fill in a load of minor cols, there are some major ones as well. As I recall the Marie Blanc was not in the sportif, and as I remember that is a pig approaching from the west. Not high, but the road goes straight up.
So how about considering the raid as a tour?