Possible or not? Change of clef in a run of grace notes
One of the transcribers for the OpenScore Lieder Corpus has transcribed a song by Augusta Holmès, which requires a change of clef in a run of six grace notes. This song is in 4/4 common time, and examples of the clef change are in the 1st, 3rd and 5th bars of the piano LH part:
Is this notation possible without all sorts of offsets being applied manually? So far I haven't found any way to achieve a neat solution. And accurate playback seems to require a hidden voice 2. Unless you increase the length of the bar and treat the grace notes as semiquavers - in which case the clef change is easy. But for OpenScore we prefer not to mess with the actual time signature as originally published, because it upsets any computer analysis of the score by musicologists.
Any thoughts or advice?