Has anyone figured out a way to integrate the factory navigation with an OEM type Satellite interface (Something that looks OEM, not an aftermarket install with a separate unit.)

 

Yep, check my signature. You can use the official MINI OEM SIRIUS unit, it integrates perfectly with your factory head unit. The main difference is that when you have the factory NAV, you can't use the OEM SIRIUS antenna - you have to use an aftermarket one. I am using a TERK SIR-MINI antenna (about US$35), but you will also need the TERK SIR-SP adapter (about US$15), which is a "dual-input to single-input" adapter, since the OEM SIRIUS receiver uses the older dual-input design, but the TERK antenna is a single-input design.

I bought both parts from etronics.com.