There was a mod kit from B&O to do this,but it involved dismantling the equipment and running a cable out the back of the Beomaster to a special receiver.
Are you using a two way remote device,such as BL7000,or the simpler BL1000/Beo4?
The simplest method,is of course to use another Link kit,it's no problem that you have one on the system already.
There is another option,that works perfectly well,but is a bit "Heath Robinson".
Regards,
Nick