Personally, I think that expecting a looper in the Kemper that would have enough functionality to be on par with popular standalone units currently on the market is not reasonable. Even the looper in the Axe FX II is pretty limited. I found it generally useless. The only thing I found it useful for was recording a riff and letting it repeat while I tweaked the preset.
Bottom line is that if you really want a good looper you're probably going to have to buy one.