Hello!
I'm affraid it is not possible, as the command orders from Avant to DVD1 will not pass through the freeview box.
The "decoder" scart could be used, but you will only get a the composite signal from the box, which is not as good as the RGB available through the AV socket.
There is a B&O accessory called "Expander". Check with your dealer, it could be a solution.
Yann.
Ne pas s'en faire et boire frais!
Mon install en images: cliquez sur mon profil, au dessus de mon avatar - Puis "My files" tout en bas.
Pictures of my setup: click on my nickname, above my avatar. Then "my files" at the bottom of the page.