USB question

[Scousus maximus]

 I recently had an RNS 510 fitted by Darren (Ace operator) and now want to get rid of the CD changer in the armrest and fit an alternative. I know the MDI is the popular choice but I'm not too keen on the re-cabling it involves and would be quite happy with just the "old" USB dock . The CD changer cabling is already there so that's half the job done. I'm aware of its limitations but I just thought it would be better than fitting the blank bin thing and would possibly give me a covered phone charging and storage box. Prices on e bay for the USB dock are stupidly high at the moment so an alternative might be to get the blank bin and fit a chassis mounted USB terminal with a voltage dropper as required, or get the old Ipod dock and convert it to USB if that's possible. Does anybody have anything to offer ( maybe an old USB box!!) or am I right off the map?
Regards,
John

[alexperkins]

CD changer wiring and the MDI wiring is different as the MDI uses the aux pins which I am lead to beleive the CD changer doesnt use.

I was considering removing the ipod dock and lead, buying an MDI insert with fly leads + the kufatec MDI loom for about £100 when you have bought them both seperately.

[Scousus maximus]

Thanks Alex,
What I'm after is to leave the CD changer cable in situ and hang "something else" on the end of it, either an old style USB dock or a converted-to-USB ipod dock. If this isn't possible I'll just put the blank bin in the armrest and add a 12 volt socket inside it for charging. It's really just for something to do that's different if I'm honest.
Regards,
John