Get it working, flash CIC with V41 of daten files and you won't need an FSC code for BMW apps.
Then buy combox, since you don't have mulf, you won't even have to disconnect it, just plug in combox (will need to move pins to a different connector) or buy retrofit harness like this



See this thread for the things the combox gives you

2009 X5 Combox Retrofit from Bimmer Tech / Patryk - Bimmerfest - BMW Forums

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