I was doing this, too, but discovered that getting a show from a full-size or other console into the Core was much harder than it should be.
Have you had to use the Core to save a gig? (Meaning your primary console irretrievably failed.)
Never, but i always have my laptop for a meterbridge.
Going from full to core is as easy as plugging my laptop into the core and sync from pc to core,,, I do this all the time with current 'performers'. Changeover takes 5 secs?
Elaboration: when the real musicians stop, who require a FOH, and the not so musical, but usb empowered person starts, there is no need, or desire, for me to stay at foh.