I've never understood how becoming Superman can be deemed embracing his heritage. It's not like he finds out that he comes from a long line of Superheroes... He just finds out he's an alien and that everyone else died because of their societies mistake.
What the discover of the truth does for him, is shows him what can happen to an entire planet, and entire race of people, if society fails. If people get too arrogant, if people get too selfish. Whatever reason they go with for Krypton exploding should be somehow relatable to earth.
Clark, discovering what caused the destruction of his people, and seeing the beginnings of a similar fate on earth if the world continues on as it is with no one standing for anything but Greed and Power, is then compelled to stand himself. Expose himself and do everything he can to help people, make their lives better, stop unneccesary hurt and pain where he can - and in the process bring back people's hope and motivation to be 'good'.
I think it'd be a good move to start with Krypton's destruction because of that.
You can still have Clark be clueless. I mean you can have Krypton's destruction and then the titles if you want.
But setting up the reasons why Krypton failed and then jumping into the worries of our world, and how Clark is viewing them (especially if they have him as a journo in the middle east or somethin) would be incredibly effective IMO.
It'd also be a good starting point for the differences between Zod and Clark. They both see earth as similar too Krypton, they both see a chance to get it right this time and make sure the same thing doesn't happen. But Zod wants to do it by force, whereas Clark believes in humanity still.