The RX2 is essentially a BG2000/5000,adapted for use with non B&O amplifiers,or earlier non data link enabled kit.
It might be possible to upgrade it by replacing the main pcb with one from say a salvaged 2000/5000?
You would need to rewire too of course,to provide the Datalink connection to the Beocentre
If your RX2 is in exceptional condition,and you have the patience and expertise to attempt the work,it's probably do-able,but otherwise it's probably more practical to look out for a nice compatible data link enabled turntable to compliment your Beocentre?
Regards,
Nick