I dunno what you call it either, but I`d call it a 35-tuplet.
This is what I would do. Others might be different.
First, get the left hand so that you don`t even have to think about it, and that the notes are played at the right time according to the right hand (It doesn`t have to be exact).
After you`ve done that, you can concentrate on your right hand. Since you can play left hand in your sleep, it will automatically speed up or slow down or whatever your right hand does.
In the right hand, you put smoothness above all else. You don`t even have to follow the fingering. (By the way, what edition do you have?) The whole 35-tuplet isn`t really too fast. If it is, then slow down your overall tempo.
If you want, you can start rit. after the top E and a tempo in the next measure.
Umm...That`s all I can think of.