Hiding Noteheads Keeping Ledger Lines and Spacing Issues in Musescore 4

Hello everyone!

I have two different questions. First of all, is it possible in Musescore 4 to hide noteheads without hiding its respective ledger lines? I want to use a specific symbol from the master palette as notehead, but in order to achieve this I need to keep the note's ledger lines in the score, which I couldn't find out how to do so far.

In second place, I've hidden in this same score a piano part to only be visible when there's music written on it. After toggling this option in the Style and Part Properties, I changed the abbreviated name of the part to a longer one, which shouldn't take any horizontal space to the pages it doesn't show up in – however, turns out that the other staves move significantly to the right everytime I change this hidden piano part's name. Since it is convenient for me to save horizontal space, is there any way to make sure this doesn't happen?

Thank you in advance for your time!