No iDrive, how to retrofit bluetooth?

Dear all,
My car is a European 220i coupe with very few options that you can find at the bottom of the message.
I know that you can code enhanced bluetooth if you have it already installed but, as you can see, I have not payed for bluetooth. On my steering wheel there is a bluetooth button so I think it is possible to retrofit it buying few spare parts, any help?

Thanks,
Dede

---
Options:
11 1J11 BMW 220I COUPé
PRICE FOR DIPLOMATS
12 0668 BLACK
13 BDAT CLOTH ’MOVE’ ANTHRACITE
14 02PA LOCKING WHEEL BOLTS
14 02VB TYRE PRESSURE MONITOR
14 0216 SERVOTRONIC
14 0249 MULTIFUNCTION FOR STEERING WHEEL
14 0255 SPORT LEATHER STEERING WHEEL
14 0320 MODEL DESIGNATION, DELETION
14 0423 FLOOR MATS IN VELOUR
14 0428 WARNING TRIANGLE
14 05DC REAR−SEAT HEADRESTS, FOLDING
14 0502 HEADLIGHT WASHER SYSTEM
14 0507 PARK DISTANCE CONTROL (PDC)
14 0520 FOG LIGHTS
14 0522 XENON LIGHT
14 0544 CRUISE CONTROL WITH BRAKING FUNCTION
14 08KA OIL−MAINTENANCE INTERVAL 24 MONTHS/30,000 KM
14 08S3 AUTOMATIC LOCK WHEN DRIVING AWAY
14 0855 LANGUAGE VERSION ITALIAN
14 0884 ITALIAN / ON−BOARD DOCUMENTATION

No iDrive, how to retrofit bluetooth?