Any in-ear meant for pro audio will get you close enough. I use Shure 215s, Customs, and studio cans and they are all honest.
People here are much more specific around here about their tone than me. I'm not trying to replicate an exact sound, I just find something awesome and run with it. Since I play live with an Avatar 2x12 with V30s, I always sculpt my tone using a V30 cab IR. It's always really close coming out of the cab without the cab sim on.
My next purchase will be a Gemini 1-P, though. Lighter and apparently the FRFR speakers have much better dispersion.
The reason I am going for the Mission cab is because the tweeter is actually mounted right on top of the other speaker. This means in a pinch you could mic the cab like a regular guitar cab if you absolutely had to.
BTW, how are you liking the Kemper? 
BTW, how are you liking the Kemper?
... all I can say is wow. Amazing.
My thoughts too. Still wowed every time.
