David,
I have part solved this issue so I can now use my Beo System 2 with a Pioneer screen albeit not to the BS2's full capabilities but it means I can use the my B&O system for sound & the Pioneer for picture and enjoy watching TV, DVD etc and better still I now have total choice of screen manufacturer. The best of both worlds!
If you have no access to a BV4 then take your Beosystem 2 to your friendly B&O dealer and ask them nicely to configure it for you. You will need to tell them what system you have eg beosound 3200, Front speakers eg Beolab 6000, centre, sub and rear or the configuration you have. It would probably be worth asking them to check the unit over at the same time just in case there are any faults with the unit that need to be fixed.
Once configured and you have the Beosystem back home you can connect the BS2 to your B&O system/speaker set up in the normal way.
You will need to programme the Beosond with your Beo4 remote to let it know that the BS2 is in situ, which if I recall correctly is Option 2 otherwise you will not get sound. Your B&O dealer will help you or just look it up in the manual.
Once this is done you can check the audio capabilities by playing a CD or radio. All being well you should now be hearing stereo sound from your front two speakers. This is how it works for me as I do not yet have my rear speakers connected.
Having sorted out the CD audio you can now connect your video source. You need two outputs for this or a splitter. One to take the picture straight to the screen, I used Component, and one to take the video audio signal straight to the BS2. For this I used Scart connected to the V Tape input on the BS2.
With this done all you now need to do is press the VTAPE selector on your Beo4 remote to activate the system. You should hear a slight click, and the speakers will the turn on, be patient however as there is a delay before the volume comes on.
All being well you should now be watching video/DVD.
Good luck.
Peter