A great trick is to send the Main Outs to the FOH plus Kemper poweramp to cab, mic a cab then blend with the Main Outs.
That's what live engineer Martin Walker is doing on the Judas Priest world tour where Andy Sneap is using two Kempers.
"I’m miking Andy as well to get something a little warmer,” says Walker. “The Kempers sound okay, but to me they sound a little brittle when you just use the DI, so he’s leaking some sound into another cab. If Andy had the choice, he would just use two DIs, but I’m just trying to bolster him a bit."
This is the way our engineer likes to do it when we play live.