Most musicians I know are never happy with the sound from In ears...I haven;t had a chance to try really expensive ones but I suspect even then they are "missing" something.
I hate ear plugs and IEM's always sound odd to me. I've even though about using a zoom recorder, to plug headphones in, and use its Mic to attenuate the sound.
Given Kemper's ability to think outside the box, some way to make this better will reduce the on stage monitor issues. Im thinking very similar to the Boss Waza idea of trying to make it more realistic ?? Would it just be guitar or wider? I think whole band ( as I like to hear the whole band not just my guitar.
No idea how or if its really needed but it seems to be a gap in the market for gutarists - a realistic IEM experience...just a thought.