Hi all,
I don't know how much CPU power is still available when all FX slots are enabled ... And, I know this is not easy to add FX slots (because of the user interface on the Kemper). A good idea is considerating the Wha pedal as a RIG parameter instead of a FX. In most of the case, the Wha is located in the front of the chain (when not,it could still be possible to add a Wha in a specific FX slot)
Another trick should be to make available the Transpose FX as Input parameter. So, when you want to use a rig be with a different tuning, it is not necessary to add a transport FX in the front of the chain (if, hopefully, there is an empty slot)