Actually, putting an 07 hemi into a 69 Charger is very simple. There are no emissions controls on a 69 Charger except for Exhaust Gas Recirculation and Positive Crankcase Ventilation. With that said, several companies (including Mopar) make stand alone PCM's that require NOTHING but plugging them in to the original engine wiring harness and some simple wiring. No programming or reflashing is required. What you want to do is have an '07 PCM function as a 2010 which is totally different. It sounds simple enough, but I don't see it happening.
For me it would be easier to convert the 2010 VVT engine into a non-VVT engine. While you have the 2010 apart to ditch the VVT make a cam/head upgrade and have the PCM reflashed. ShopHemi.com advertises a 100+ HP upgrade that includes the tuner for the flash for like $3100.00:
http://www.shophemi.com/p-1211-57-61-hemi-power-trip-package.aspx