Hello,
I used to have a similar setup and used a Scart router to fix this.
This scart router has 2 scart outputs; can be used for the tv and one for the beamer. It also has dolby digital in- and outputs and several inputs, making it easy to extend the connection possibilities to your avant.
The way i used it was that I connected a non B&O through scart and DD to the avant and from the dvd player directly to the beamer by component video (for better picture quality). But as said before, you can also connect it from the router to the beamer.
Since I have upgraded to the BV8 I am not using the router at the moment; if you are interested let me know. I live in the Netherlands and have no idea on shipping costs etc. Please PM me if you are interested.
Best Regards,
Bieele