I take it that no one is reading the question.
The powered head is 600w at 8ohm and 300w at 16ohm
I want to be able to use 8 inch and 10 inch speaker from the powered head
Not to sound rude, but it’s more likely that you haven’t explained your issue correctly/in a way that people understand than that they aren’t reading it.
You first asked in the OP “Is there a way or anything on the market to get the Kemper through an 8 inch or 10 inch speaker?” without explaining that you were using a powered head. Then, when I mentioned that you could run a a separate power amp into any speaker cab you wanted, you asked for recommendations, so I provided one.
Let’s start over.
You have a powered head (or two for stereo) and you want to run it/them into a speaker cabinet(s) with 8” or 10” speakers, is that correct? If so, why don’t you buy a cabinet (or two) with 8” or 10” speakers and plug the Kemper(s) directly into the cabinet(s)?
Are you asking for cabinet recommendations? If so, where are you located?