I’m not familiar with this type of notation so please ignore if this is not helpful, but could you use the Flip ornament instead? In the first bar I inserted it as an ornament, in the second bar I created a playing technique with the glyph (it’s in the Brass techniques category) and scaled it to 125%. Both are then repositioned in Engrave mode.
I’ve also created a playing technique with a glyph that looked acceptable.
Still, I find it irritating that one cannot just click on the bend and then get the lines between notes. Semantics … yes … ok … but sometimes I just want a break!