The reverse grid idea won't work while it's impossible to for cars to follow and pass.
Reverse grids work in series where the cars are equal and passing is possible. The impression is reverse grids will see lots of overtaking, when in reality it will see lots of processions with a soundtrack of drivers complaining. Even in the all conquouring Mercedes and with DRS Hamilton struggled to pass anyone once he dropped to 7th.
The only time we see people out of position coming back throgh the field is when they have the opportunity to alter their strategy, usually tyres and aero. That is not possible under normal circumstances. But there in lies the solution. We don't need to break qualifying or artificially screw with the race, what we need is cars lined up on the grid with varying strategies and an ability to pass each other. Nothing fake, nothing artificial, just... Common sense.