I agree about it being B&O's fault. I did mail B&O once about it but just got the standard reply saying "Sorry contact you dealer etc etc" (seems to be a standard reply for every mail). Al remains silent when I mail them saying my dealer no longer exist where I bought my 4500.
Over the years I have collected several broken 4500 and 3500 components to use as spares. I have fitted a 3500 glas pabel to a 4500 and I can confirm it works even though the plug on the end of the cable can be slightly different, but with a bit of force it wil fit.