No need for the RE_BL
Just buy the cheepest IR remote set for PS3 you can find, and use the IR-USB receiver from it.
Connect your IR-wire from PUC 1-4 to the IR-USB receiver and select PS3 in the PUC list in the setup.
The only thing is, that you can not turn the PS3 on. but we all need some exercise, and for most of the time your getting up to put in the DVD/Blueray disk you can turn the PS3 off, in the PS Menu (all the way to the left and to the top)
About the noice.... i have the PS3 Slim, and if it breaths ok, then the sound level is acceptable.
And together with the PS3Mediaserver http://ps3mediaserver.blogspot.com/ (Freeware) installed on a network PC/MAC it is a brilliant solution Acces your pictures/movies/Music from your Beo4/5
A solution for getting HDMI to linkrooms would be, to use a Atlon HDMI matrix. (Words from Bang & Olufsen Struer)