Mastering: allow a single FX chain to be applied to several tracks but not all

In the Project page (Mastering view) of Studio One 3, we have the ability to apply an FX chain to either a single track (via the track's Inserts panel) or all tracks (via the Master Inserts panel). I would like to be able to apply a single FX chain to a subset of the tracks, without having to create an instance of the chain for each track.

To illustrate why: I am mastering some compilation CDs of live classical recordings from old tapes, with 15-20 tracks per CD. I use Izotope Ozone 8 plus a couple of other plugins. The CD I'm currently working on has tracks from two different source tapes. The first 9 tracks come from tape 1 and the other 10 tracks from tape 2. I import the tracks from each source tape as a single audio file containing multiple pieces, so I start with 2 audio events/CD tracks in the project. I configure an FX chain on each of these so that I can tweak the sounds of the two tapes to match one another (typically using Ozone 8). Then I mark the CD tracks using the "Split track at cursor" command, so I end up with 19 tracks over 2 audio events. At this point the only way to apply the first FX chain to tracks 1-9 and the second FX chain to tracks 10-20 is to copy one of the chains to each individual track. But this causes Studio One to create an instance of each plugin for each track. I end up with 20 instances of Ozone 8, which uses a ton of memory and brings Studio One to a crawl. 9 of these instances have identical settings for source tape 1 and the other 10 have identical settings for source tape 2. It's hugely wasteful of resources when in principle I should need only 2 instances of Ozone, each applied to half of the tracks on the CD.

So I would like the ability to group CD tracks in the Project view and apply a single FX chain to each group of tracks. That way I could achieve the same result with 2 instances of each plugin instead of 20.