Is 45421 with a hop down to the next more appropriate?
Oh yeah, another personal tip I can share about this piece is that it is very helpful to learn to play parts of it with exaggerated staccato - to learn to play every note individually with speed.
Mound, I can understand why you use the 45421 here because later on when you play the repeating quintuplets throughout the song, that is the required fingering.