Q is right - between 9 and 2 is a no, no...
Don't be shy with the carrera day date - my favourite daily wearer, in fact! Has been solid since day one and is a great rep to boot! The day can get a little 'jammy' though, so its important not to force it if you encounter this.
I'm not 100% sure of this, but don't all 6,9,12 7750 movements ship with day and date wheels?