Timewarp instead of Twixtor uses same principle to extend longer footage but goes about it slightly different to get 23.976p
1. You need to make a comp with de-interlaced footage and then sub-comp that in another comp-“effect_add”. Now you can access the longer, slower clip.
2. Apply Timewarp to “effect_add” comp to 98.75 with extreme filter.
2. Drag “effect_add” comp into new “resynced” comp and timestretch to 98.75. no sound
3. add original footage as just sound to “resynced” comp and enable timeremapping for frame accurate sync.