My 2 bobs,
me personally, I would divert for the fuel if you can, if you cant (no options) then that's been covered above. 2 points for further consideration though:
1. Departure Alternates:these are only required to be above the landing minima to satisfy the requirements, and
2. In the event you push on and something happens, its not only CASA you need to be able to convince, its the legal system you will have to satisfy to stay out of jail.
No one should ever be criticized for a diversion in these circumstances. If you do, get it in writing and have a good think about what to do with that.