Reese, to expand on what Mike C said, if you have a stage box for the SQ, one side of the analog splitter would go into the stage box inputs and the other side would go directly to the SI Expression inputs. A friend has been using a similar setup for several years to run a GLD at FOH and Qu-32 at monitors.
I have about 3/4 of the pieces I need to build my own version of the CBI splitter, but currently don’t have many shows where it’s really needed. When finished, the splitter will be on the back side of same rack as my AR2412 with a short set of tails going to directly to the stage box and the “monitor” side on a pair of 56-pin EDAC connectors; I have several 16-pair cables with the other end of the EDAC already on them from previous projects.