So just to follow up on this one and after having a lot of thoughts, I ended up with the jack of all trade solution. A bit more expensive, but I would not go down on features and risk limiting myself.
I ditched the idea of connection hub, as it would rely too much of IR signals from the LG remote, and it would cripple me in terms of getting a proper 3.0 setup. So I ended up with a full blown solution using a marantz NR1607 with preout terminals.
So the connections are like this: TV HDMI-ARC(w. CEC) -> Marantz -> Stereo phono cable with trigger signal to powerlink female -> Beolab 9 in PL mode. This works like a charm.
The AV receiver is controlled via HDMI-CEC from the TV, so the speakers will be adjusted through the AV receiver, just using the tv remote.
Now that I have mentioned it, the remote. The LG remote is better than most other brands I have used, though there's a long way to go before you get the feel of a B&O remote. The B&O remote and the simple control of the UI is what really shines through, and it was the first thing I was missing and I will without doubt be missing it in the future as well.