Custom harp notation for "whistling sounds"?

I’m trying to create this unique harp notation which involves two stacked noteheads separated by an arrowhead in between, as seen below -

So the very first thing I did was go into the vertical line editor and created a custom double line, thin, with added spacing in between, and then selected the chevron arrowhead as an end cap -

It’s almost there but as you can see I drew an arrow pointing at a weird gap issue on the left side, where the left line is noticeably lower -

I also created a downward arrow version by reversing the end cap, same issue.

Next I went to apply this to my actual notes (after toggling hide stem). At first it places the vertical line to the side, which makes sense, but after playing with the “distance from item” settings, I was unable to produce a result where it could encircle the noteheads. I noticed also the bottom panel does not appear to have an offset for horizontal positioning, so I manually moved it over the noteheads inside of Engrave mode. Currently this is far as I could get it:

(each measure showing before & after engrave mode adjustment)

Finally I looked but couldn’t find a way to remove ledger lines as shown in the original example.

I am attaching my simple project file here in case anyone is able to take a look at my line editor and recommend how to fix this.

And if there is an even better way to approach this than I’m attempting, please let me know!

harp whistle notation.dorico (427.2 KB)

harp whistle notation 2.dorico (425.0 KB)

My attempt.

Create a new Notehead Set called Whistle with the stem attachment points brought in.
Create another Nothead Set called Arrow with the Arrow. (I used a String technique symbol.)
Put one of the notes in a different voice. So, you have one upsteam and one downstem note.
Set the notehead to the left and set Voice Column Index to 1 in Engrave Mode.
Set the Notehead set Whistle for the two notes.
Add a new note below the top note and set the Notehead set to Arrow.
Hide ledger lines in engrave mode.
Extend stems to desired length.

I hope I didn’t miss anything.

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