I'd like to present to you my version of the Scherzo and the finale of the "Unfinished". If you think that the Unfinished is complete and perfect as it is then you are right, but then you can please consider these movements just on their own...
I orchestrated the main part from Schubert's piano reduction and completed the Trio of which only the begining was sketched by Schubert with a few bars of the melodic line. I love this Scherzo - it is powerful, passionate and melodious !
https://youtu.be/FSndEjJPeTM
Regarding the Finale I also believe as others that Schubert took the original finale and used it for the balett music Rosamunde as this work lacks the drive and the flow to be fitting for a symphonic finale. Schubert changed the original title "Allegro moderato" (like the 1st movement) of this work later on even to "Allegro molto moderato" in the Rosamunde score which is even more unfitting for a finale. So I did some adjustments to give this movement more flow and dynamics (see the yellow markings in the score):
https://youtu.be/L3yOwZ8OEns
I hope you will enjoy it ...