An emonBase is an emonPi without the 2-channel cut down emonTx inside it. You can’t have a second voltage and current front end inside, there isn’t room for it or the additional connectors.
Look here. All I know about that build is in the thread, but I think that would solve your 6 local channels problem with ease. You’d still need the emonTx for the 4 remote channels, and the emonBase, which could run your local emonCMS accepting the data from both the emonTx and the “overeasy” unit.
Otherwise, it looks as if you need one emonPi and 2 x emonTx, the emonPi and one emonTx being co-located to handle the 6 channels, and the remote emonTx handling 4 channels.
I’m assuming it’s a single phase system, but as you’ve put a very silly answer for your country, I’ve no idea what power system you have. There was a good reason for that question - perhaps you can see what that reason is now?