Why not get a unit thet is just for power - a true"amp" as opposed to guitar amp -ie one with no preamp section. I fear that even the clean version of the VOX will color your tone. Seriously, beware.
See now, to jump to the theme of your other thread, if you could not afford an amp as described above, THAT would be a reson to sell a guitar based on the cost benefit (marginal return) of another guitar compared to a stellar amp for that awesome Kemper. It is too big of an inevesment not to make it shine. While I think you were wise not to purchase the included 500w amp (good golly!), I think it would be unwise to sacrifice quality in this amp purchase. Also, I think that you SHOULD have an amp to power this thing. It needs to speak out loud!!!