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I don't know all the ins and out of the latest converting tools for picture. I do know that there are plug-ins for AVID and FCP, and also After Effects does a good job of converting footage without a speed change. But on the projects where they wanted to not risk any motion problems, the 24-->25 change was done as frame=a frame. So I had to adjust speeds.
When knowing this, my plan is adjust stems and remix. I realize you are saying that a pitch change is not an option, but:
The best, most accurate speed change I know is the SRC trick.
For changing pitch:
Dialogue : Digidesign's X-Form (Izotope) or Waves Soundshifter.
Music: Pitch N' Time Pro.
FX and BG's? Who cares. I leave as is.
Those are my thoughts if you get stuck and have to change speeds.
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