Selecting multiple notes in brackets

I transcribed a few bars of drums.
Some of the notes played on the snare are ghost notes, and I put them in parentheses (brackets). Now I would like to select all the ghost notes played on the snare and set them smaller noteheads. Setting each ghost note separately would be very time consuming.
I can't find such option in "Select menu".

It's very important that I don't want to select notes that aren't ghost notes.