gradual tremolo using start feathered beam

Hi everyone,
I wanted to write a gradual tremolo for my piece and I found the "start feathered beam" which is quite useful. However I can't really write it the way I'd like to because of the way the notes a grouped by four. I was wondering if this was possible to join all the thirty-notes together in order to apply the beam.
Here is a picture of what I'd like to do, and a picture of the way it is right now.