Problem solved! Thanks to Wheresthedug
So, what I have now is Send 2 on the Kemper --> Trio+ input with the X effect slot set to effect loop triggered by the II stomp. I am not using the Return input on the Kemper. When II stomp is engaged the signal goes to the looper and does not go out the Main L/R outputs. When II stomp is off the signal only goes to the Main L/R. Exactly what I wanted.
Now I can go back to using the Guitar Out on the Trio+ to separate the guitar signal from the Bass and drums as ThrashFlesh suggested. That's the way I used it before I got the Kemper (less than a month ago).
Now I need to learn the best (quickest) way to assign that X effect slot to all Rigs.... damn this hole just gets deeper and deeper....