Sounds like you have pretty much ticked everybox on the options list; so you can't go to wrong.
One question, the aftermarket bluetooth kit is more expensive than the dealer fitted Volkswagen item; so why don't you just stick with the factory option?
As for using the iPhone off the factory MDI fitted to the RCD510, it goes in the glove box which may be inconvenient if you are taking your iPhone in and out all the time; potentially buy yourself another iPod and stick that in there permanently [I realise this won't solve you iPhone charging issue, but it is way more convenient].
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