quarter flat accidental missing

Hi everyone,

I am transcribing this figure (see attached) by Tristan Murail, from his article “The Revolution of Complex Sounds”. I need the figure to look ‘as is’.

Any suggestions on how to get this particular quarter flat accidental? Am I missing it somewhere?

And, for those at Dorico, is there any way this symbol (and the other quarter sharp) can be added on the next update?

thanks again.
quarter sharp from Sibelius.jpg

Bravura implements a whole consort of different conventions — about twenty, if I recall correctly. Dorico simply uses by default another one. To use these symbols, the Stein-Zimmermann set, you’ll have to edit the tuning system (or eventually create a new one) and edit the adequate glyphs, replacing them with the ones from said set.