I think people are thinking way too hard about this.
It is both highly complex, when you break it down, yet really simple in essence.
Clark Kent was raised out in a rural area, on a farm. A reality close knit, old school kinda town - we all low the type and and we can all relate to it - it's not an alien concept. He is also, morally, a very good, kind and compassionate person who puts others before him.
He has these amazing powers and knowledge that he is not from here, but, like the rest of us, he is pretty much helpless to finding out more.
He decides to use his powers to good use - stopping crime, injustice and helping where he can in natural disasters, environmental impacts etc.
How can he do that without solely relying on his super strength and powers? reporting!
He goes into a career in journalism and reporting - he is quality at it and his reporting is making a difference.
He knows Superman isn't the answer, but it can inspire help people towards an ideal.
Sure, his life will be different - his close friends at smallville all know the truth, but, the bigger picture, he will need an alter ego - what does he do? decide to make himself subtle, which naturally lines u with his character and make superman this bold, colourful persona that can help where clark cannot.
Jimmy is a close friend and the two are almost like college buddies - would jimmy find out? Eventually...
Would lois warm to clark straight away? probably not, would clark like her? 100%. It's the classic coming of age story.
So what a director needs to focus on, is the warmth and character of clark, in his own element - the fun we can have seeing him dart off and foiling a bank robbery, saving a family from a house fire, miners down a well - him talking about it back at smallville.
Honestly, i know social media is huge these days, but Superman and his heroics wouldn't be a daily thing, sure, he can be around daily - swooping through the sky, but would he be on camera, clearly, so much that it's obvious it's clark - i don't think so.
So, let's use someone like Wayne Rooney - in England everyone knows him, he goes out to washington dc and goes about town, no one bats an eye lid - sure they have seen him on tv, adverts etc he has had 15 years exposure but to the general public they rent looking for him.
So if the director handles it that people aren't looking for an alter ego, if clark is just one of the guy at best, i think it could be a beautiful movie.
I think of it like this, As Superman, he is Thor. As Clark, he is Steve Rogers. At the planet, he is Bruce Banner.