Hi Carl, I have read your post a couple of times and like Alex I am slightly confused by the exact questions to which you want answers.
I have a BV7-40 Mark 3 and can tell you that connectivity will not be a problem you'll be faced with given the components you have. The B&O installers should set this all up without you having to worry about what goes where. The BeloLab 2000s will work fine in your setup.
I am slightly confused as to the BV7-32 you have; where it is positioned (in relation to the new BV7-40 - which should be your new master) and what you actually want from the entire setup. The installers should sort all this out for you.
On the subject of Beo5 - my thoughts on this are as follows. I think it is very much a dealership issue. I consider myself fortunate that my local dealership (Bath, South West UK) have gone out of their way to give me the best setup they can with my Beo5, albeit at my request! They have configured my B&O hardware along with my Lutron lighting products throughout the home. I am most grateful for this and particualrly to Keith who provided the Lutron Rania XML code that was hugely beneficial for me (and I am sure many other users) of this forum.
It is clear that of the many B&O dealerships out there (some franchised - some not) - there are those that stand out from the crowd and do their absolute best to help you and keep you as a loyal customer. Bath are that kind of dealership; credit given where credit due. The customer experience I have received from that shop to date has been excellent.
I can only wish you the same experience with the dealership local to you.
Simon.