the only reason i've done it this way is because a member on Audi Sport back when i was a member had newer sensors plugged into his old module from his factory sensors and it all worked fine. around the same time the 2004 sensor kit came up for sale for a reasonable price so i went for it.
the difference with me, ofc, is that i don't have factory sensors so the plan was to use the older wiring from my CECM to the module, and then the newer wiring from my module to the speakers. it can't harm to try, and if it doesn't work i'll sell the sensors with the kufatec loom to get some of my money back. i'm just worried my CECM won't support sensors at all, tho i'd be surprised because i've got auto lights/wipers on my car and a couple of other high spec bits.
not all MY09+ 8Ps have front sensors, so i'd be surprised if that was an absolute requirement to getting it all working. in fact i know of more than one person who've just fitted the rears so fingers crossed it should be fine. if not, well i've already got the late model RNS-E so maybe i'll just fit front sensors as well lol. i've actually got 4 spare after all!
thanks very much for your help mate - i owe you a pint or something definitely. i've asked these questions before on other forums and nobody has been anywhere near as helpful as you, even people who i know know the answers!