One way that i can think of is to add an DA converter and use SPDIF to output the DLY/REV Wet portion and use Monitor Out for the Stack portion for your onstage monitoring . Link for Monitor and SPDIF out are checked so you can control the stage volume from the Master Volume.
Main Output would deliver the Master Stereo signal. Main Out link is unchecked to deliver a constant level to FOH.
A different approach would need to send a w/d/w signal to FOH:
Main Output set to carry the DLY/REV Wet portion and Direct Out for the Stack portion going to FOH. Both Outputs unlinked.
The Headphone Output (linked) for the DLY/REV Wet portion and Monitor Out (linked) for the Stack portion to your onstage monitoring.
Thanks! Another way I was thinking of was to send the wet stereo effects to my JBLs, and Monitor out(dry stack) to say a TC Bam200, which I believe has a direct out, the JBLs also have a direct line out, so I could then send all 3 signal to FOH.