Welcome!
No, unfortunately you can't combine profiles.
It is possible to profile multiple amps in one go (I think the results may vary, though), by using a mixer and a splitter etc.
Yes, you can combine profiles if you profile both amps yourself at the same time using a splitter and merge the sound via a mixing desk.
You would need to have splitter to split the sound from the kemper into two amps and then 2 mic's or if you want to go direct connect to a DI box with 2 inputs. Then connect either the mics or the line level signal from the DI box to a mixing desk and feed that into the Kemper for analysis.
(PS: I should start reading previous posts as Michael_DK already said what I said).
PS2: I tihnk you may get phasing issues though but I can't attest to that as I haven't even considered trying it. But I see your point as f.i. Phil X uses 2 amps to blend his sound which leads to a massive killer sound.
Welcome, Ruthless!
I predict that eventually we will be able to morph from one amp to another using the current hardware.
Welcome to the Family 
Yes morphing one to the other would be cool
It would also be cool if we could run a dual amp setup with one profile panned right and one profile panned left. Probably a serious drain on processing resources, though.
Maybe its cool for a feature request. Years ago i had a line 6 19" unit, there was are function to fade between to sounds of differenr amp. This was a cool solution and i think its maybe only a software thing to have it, but i dont know how difficult it is for the kpa structur.
