I quite like the sprint, so my rather boring opinion is to move the qualifying to Saturday afternoon, then slide the sprint race and it’s qualifying forward a slot. I would then have Parc Ferme kick in at qualifying at the some time as a normal weekend.
This would mean teams can and will play around with setup over the sprint quali and race, but I’m ok with that given the smaller point allocation. Also neither the qualifying or the sprint itself are necessarily ideal places to be playing around with setup too much, especially since no one pits in the sprint, so doing too much setup change might be a risk for a team. It does mean those that got it terribly wrong after FP1 can gamble on some setup changes however. Ultimately coming out of the sprint you’d still need a car fit to go through the GPs qualifying and race, so there’s still that to balance things a bit.
The reverse grid suggestion is interesting, but I’m not sure how it’ll work in practice and perhaps it needs to be a longer race then to allow more time to come through the field. If teams feel the sprint is too high risk already, I can’t see the top teams wanting to now come through a field every sprint session. If they’re going to do this they need to pick tracks with high overtaking rates.