Complex measure w/cross-staff tied grace notes help

Greetings all!

I'm arranging Ravel's "Pavane" for a small ensemble. The piano's second to last measure is rather complex, as can be seen here:

I'm not changing the piano part here, other than dynamics & articulations. I've gotten this far in the recreation by attaching the appropriate grace notes to each individual voice, tying the notes while preventing them from playing (except those in the treble staff), hiding all but those in the treble staff, and dragging the ties to the correct locations:

My issue is obvious - I'd prefer the grayed out grace notes to not affect the overall measure spacing. Playing with the offsets doesn't seem to work. Perfect playback is not necessary. Any ideas?

(also, I haven't otherwise finished tweaking the appearance yet - sliding the beat 3 E's, moving the F# accent, etc.)

Thanks!

v/r

Ken S.