brackets around noteheads

[Orm Finnendahl]

Hi,

I would like to write noteheads with brackets around them (preferably
square brackets) without using Markup commands, as most of them have
to be on ledger lines and it is very awkward to get those drawn. It
would be very nice to enter the notes in question using a new voice
context in order to be able to get them at defined rhythmic
positions.

Is there an easy way to get that done?

Yours,
Orm