I found this video on youtube quite interesting -
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I'm in a similar situation and love the headphone sound, but cannot play loud through speakers. Haven't had a chance to try any of the tips in the video but I wonder if it would be possible to use some of the techniques to EQ profiles that have been set up to sound good at high volume to sound ok/good at bedroom volume.
You must have bought the powered Kemper from L&M, I picked up an unpowered one from them a month ago as well.