Looking for a better way to do this

About half the time, the G5 referred to in the organ part will be present, and my preference is that bracketed chord be a fermata rest. I only have a year to get this score ready. (This page, which includes strings and choir, is very crowded already and there’s no room for an ossia brace or a three-bar second ending.) Your suggestions welcome.

I think I will end up here - displaying my preference but anticipating the alternative with implied permission. I have a blank page facing, so I will add notes there, and an ossia brace in the part for the orgelspieler. (I’m showing the two violin parts below)