Thank you for your answers.
I already tried the method suggested by pianoleo and LSalgueiro, and the followings happen:
- Placing a comma at the nearest position of the barline, i.e. the last demisemiquaver in a bar attaches the comma in the next bar.
- Placing a comma on a barline attaches the comma in the next bar same as No. 1.
- Placing a comma at the position of the last semiquaver in a bar attaches the comma before the grace note.
I know the notation is not common. The long notes must slightly be raised by sliding. In other places, there are enough rests. There is only one weird situation where I used at the semantically unhelpful position… I could, of course, begin the sliding semiquaver earlier, but I do not want it. The following is the complete scene of these:
Oh, I am just a pitiable composer and the musicians who must play this piece are more pitiable than me. Sorry to my performer.
Anyway, I will find a solution.