Interesting power amp for non-powered Kemper. Koch ATR4502 90W Stereo Rack-Mounted Tube Guitar Power Amp.
http://www.koch-amps.com/guitar-poweramp-atr-4502.html
Could be interesting to try, has a stereo option. It's also light weight and runs as class A, so you will get that initial thump when you play (but with added heat). It should be loud too, get those pants flapping, lol.