I use vmem for my BM5, and it works for me when I press vmem outside using my Beovox 1 connect to beolink passive.
In the kitchen I can choose to vmem and get the BM5 navigation (i.e. N.MUSIC or Photo) with the normal link tv quality. It is usable.
To get the sound in stereo I then press AV+vmem, if I just press AV+vmem I only get the sound and no picture.
I can also choose to listen to n.music or n.radio on the beolink passive.
It works OK for me.
There is something about B&O.....