Aleatoric notation

Screenshot 2024-06-28 at 4.46.29 pm
Hi folks, hoping to find a solution to notating something similar to this example (from a Leo Brouwer piece) where the repeated figure is to be played as fast as possible, repeated 5 times. Any suggestions would be so helpful!

Also, is there a simple way to add the diagonal line across a beam/stem?

Not sure what’s going on a the beginning, but isn’t it just hidden noteheads?

You might have to do the grace notes in another voice.

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