I think for the time being your only option would be something a bit grim, like creating a playing technique that looks like an accent articulation and which triggers pt.accent, which you create with the same duration as the tremolo note.
I think for the time being your only option would be something a bit grim, like creating a playing technique that looks like an accent articulation and which triggers pt.accent, which you create with the same duration as the tremolo note.