I can't see why it couldn't work. The 3-pin IR receiver modules (as the 38 kHz one
 as described over there) output the demodulated base band bit stream, 
and after that time B&O remotes aren't any different from others. 
If the software just compares the input to a previously trained pulse pattern without trying to decode it somehow, it should be fine. Beware though that some B&O commands can be quite long and the 
software of this receiver might not be prepared for those.
You 
will of course need to fit it with a 455 kHz receiver module, as you 
say. The difficult thing here is that Vishay has discontinued the 
TSOP7000 IC, and I don't know of any replacements. If you manage to find
 them somewhere, keep in mind that their pinout is different from the 
lower frequency parts, although they look the same!
You could probably also use a B&O "hockey puck" IR transceiver as the receiver.