I've never heard of anyone doing that. What is doable is to drop from Discovery Pinnacle down to the upper Crabtree Lake, and over Crabtree Pass to Sky Blue. That is a well-known route.
Here's a
link to the gmap4 online map of the area. Switch between Satellite (zooming in) and T4 Topo, to check possible routes. From the satellite view, getting to Mt McAdie from Whitney Pass appears rough and rugged.
Looking at the topo and satellite views, it appears you could get from Sky Blue to Meysan, crossing just south of Mt Mallory. Check the climbers guides for Mt Mallory.
Bottom line: Are you looking at this due to the Trail Crest exit permit requirements? Depending on how early you start your trip, there are walk-in exit permits available. And you might adjust your exit schedule +/- a day for that permit.