Why stick your neck out and operate outside of Boeing's recommendations and company SOP's? If it was a life threatening situation, it would be understandable, but a relatively benign HYD QTY LOW? Sadly, I'm not sure the industrial tribunal or court system would take your side had it turned out badly. Follow the SOP's , divert if necessary and go home. Let the company clear up the subsequent mess.
There doesn't seem to be much room left for intiative in commercial airline flying nowadays. When you see the calibre of person running the airlines management, you understand why.