The BMW bluetooth systems can be confusing. Your system isn't a ULF system, but a TCU based system, since you have BMW Assist with Bluetooth. All the TCU based systems have only VR commands for the phone only. No NAV commands, hence your problem.

As posts previously have stated, if you want to keep assist, there not much you can do. However, if you dont use assist, but just want bluetooth, you could replace the TCU with a ULF unit. This would give you VR commands for the phone + Nav + the notepad feature.

With regards to the parts you need for the phone center console, I would go along to http://www.bimmernav.com you should fine what you need there.

Cheers, Adrian