I posted elsewhere that I had seen this done.
Just tried it and it works. (This was a test only, and you should test it yourself before permanently implementing)
Connect the first to the active or passive as you normally would. Then using the supplied B&O IR cable (or by a new one) cut off the din socket. Connect the second hockey puck (IR eye) to the first using the cable. Be sure the wires are correct.
Keep the total distance below 10mtrs. The IR lights dim otherwise.
My electrician mentioned it may also work via a DIN double adapter on the Active or Passive.
Beoaus.