New glyph proposal: Gothic g clef

[SirPL]

This is my very first post here, so I would like to say hello to everyone.
I want to say that my english is not preety good, so I apologize for any typos and grammar mistakes.

I will start with new glyph proposal. I had access to Roman Missal in german language. Publisher of this publication used notation that I've seen for the first time. It's two-lined gregorian chant with square notes and odd g clef. Heres's an example:


I think the clef may be worth adding to SMuFL standard.