There's no precedent of DQing 15 years after the event, so they can pretty much do what they want. Going the schumacher route means the results don't change.
That sounds like the easiest route, but how would it be implemented to a race result? Schumacher kept his points and results but everyone shuffled up the WDC table. Frentzen was second, Coulthard third, etc.
So really, I’m not understanding how you could do the Schumacher route without everyone being shuffled up.
In fact, not that I’ve made this comparison the Schumacher disqualification makes perfect sense. When you’re disqualified from a race you keep your finish time; you’re just not included in the final results. Everyone else moved up (Brazil 1983 excepted). So it was for Michael and the 1997 WDC.