Hi, I have an idea to apply parenthesis without creating a new note head (and can be applied to any notehead). You only have to substitute the symbol for the jazz articulations “plop bend” and “doit bend”, the first one by a “(” and the second one by a “)”. Then you can apply the parenthesis at will:
PS: You have to change teh setting Engraving options>Jazz articulations>Vertical offset for bend… to 0.
Nice! How does it look with chords?
Xavier, I love this trick ! Congrats, that’s the third interesting (and brand new) trick that you offer, in no time ! Nice to have you around 
Like this:
But if you use the other jass articulations to create longer parenthesis, I think you can get very good results (I guess you will have to put a transparent note in the middle of the chord with a large parenthesis attatched)
Thank you Marc! As I said before, necessity makes me think harder. I am happy to contribute to the community, I also get a lot from you all
To echo what Marc said… these are quite ingenious.
And to echo what Daniel said elsewhere… hopefully they won’t be needed for long. 
Thank you dankreider, we all are waiting for next major update as it were the day before Chistmas 
This is terribly handy. Thanks!
You are welcome!
Very nice!
I’ve been using this trick for a Rameau-type ornamentation (port-de-voix pincé) I should have shared it. But Kudos!
I guess I might try to repair the incorrect standard positioning of the Schleifer ornament this way, for the time being. (See also this thread).