If you have such a thingy (which i do, a costum built one from t-rex) and you think it sounds great on certain sounds here is a good way to replicate it:
1 - Connect the send to the return. Profile that while making sure you are making a direct amp profile. Save the rig.
2 - Now do the same with the cab emu in the loop. Save that rig under a different name.
3 - Create a merged profile of the two. Then save the cabinet as a preset.
What you have now is a good profile of your cab emulator box.
I tried to make an IR of it too, but the result (while good in my DAW) was not good in the Kemper. The above mentioned method is the way to go.