Triangular noteheads as the highest/lowest possible pitch. Notation

Your idea

I propose to implement such notation in Musescore, taking into account the correct vertical alignment of such notes (depending on the free space and the placement of previous notes).

Problem to be solved

This will allow users (instead of taking up a bunch of vertical space and using octave lines) to specify the highest or lowest pitch as a note.
Recently, I had the need to write a glissando from the note cluster (I will create an issue about it separately) to the highest note. I managed to get the desired look (but not the sound) with difficulty, for this I had to manually align the stems, hide the noteheads, add specially designed symbols from the palette, etc. It's very painstaking and tedious. To avoid this, I just propose to implement it.

Additional context

Basically, such notes are used only to indicate the final pitch of the glissando. I will note only some basic details:

1. The stems of such notes should not be centered on the edge (as with ordinary notes), but in the center of the musical notehead;
2. The vertical arrangement of such notes (above the staff - for the highest pitch and below - for the lowest) should depend on how high or low the previous note was located on the staff / ledger lines;
3. The guide says that to indicate the whole note, you need to use two halves connected by a tie. I suggest that we reconsider this designation option and take into account that in the SMuFL there are special noteheads designed for both minim and semibreve notehead-values.