Yes, via your Beosound 9000. Compared to running small or flat cabling, it would be much more expensive, but it can be accomplished.
Using a BS 3200 and 4 BL 4000 active speakers, I experimented with the wireless modules first, but eventually ended up running flat cables inside tile baseboard. This coincided with the addition of a Beoport, BL 2000's upstairs, with very good results.
A consideration to factor in is what other wireless devices ( telephone, other remotes, etc ) you could, or would have operating within your wireless zone. There can be interzonal interference between devices: One experience was the PC Media Centre remote would audibly interfere with the rear speakers, and mysteriously open the glass doors on the BS 3200.