I'm not sure what you mean re. the two other BT options. 6NK and 6NH? If you select either of these it will deselect pro nav because pro nav already includes them. You don't need any other Bluetooth options with pro nav.
Re. reading and displaying text messages, this will work but only if your phone supports it. iPhones don't support this for example. You can check your phone's compatibility and see what's supported on the UK website
The other things like streaming Bluetooth audio will all work with pro nav - no need for 6NR or internet. You can also connect phones with music files using a USB and navigate and play albums on the iDrive screen
BMW X3 (F25) xDrive20d SE . . titanium silver . . titanium front grille . . 309s . . xline . . xenons . . black leather . . alu trim . . professional multimedia package . . dynamic package . . climate package . . electric seats . . folding mirrors . . servotronic steering . . DAB radio . . business speakers . . sun protection glass . . split rear seats . .