I don't know how many Kemper users incorporated outside effects pedals. I have tried using my front-end only pedal board with my Kemper and had great success.
Last week, I found a brand new ultra low-gain pedal that will not change the transparency of an amp, or the Kemper. It's called the "ID" by John Coloccia. This is the most transparent pedal I have ever heard, but it has tone shaping controls that work extremely well in any situation.
On the Gear Page Effects forum, they have threads and youtube vids about it. I only mention it as there may be players here who could put it to good use.
I sure did! 