I think your wrist shape is more important than wrist size- If you have a relatively flat wrist, I think pulling off a Bentley 6.75 is doable.
Will it be big? Yeah... For most people, a watch of this size is going to have some significant wrist presence (unless you're POTR); however, if it wears comfortably, isn't riding up and down the wrist, or spinning around and if the lugs are curved/conformed (a la the Montbrillant Legende) it would be completely acceptable, in my opinion. To me, it's more about how it wears.
Also, the 44/45mm Breits have a tendancy to be top heavy, as the cases are quite thick in profile relative to diameter/width of the case. With the wider diameter case, the proportions are a bit better, and the watch tends to sit a bit flatter.