fill with "slash", variable icon

I would like to be able to change the icon used for "fill with slash."
Instead of a slash, I would like to choose the filling icon from
anything in the pallets. In particular, I'd like the vertical down/up
squiggle/arrow. I don't know its music symbol name.

I'd use it to represent a guitar strum, specific notes not important, but timing placement is.

Right now it is a real pain to add vertical shape, then make a note+stem invisible.

Dick Penny