I can honestly say that I have no intention of this becoming as intense as District 9. I didn't remember until I looked it up, but I did see it years ago when it first came out and it's not one I'm anxious to watch again.
I don't know exactly how this story will play out. I have a vague idea of how he might become Superman but its all just up in head space right now.

I do have a pretty decent backstory mapped out which I shared with Queenie and Carrie while they were helping me with the title. I'm thinking I might turn that into a multi-chapter prequel to this but I don't plan to post it until it's all written and not sure when since I have a few other projects.
To answer your questions though, the armband needs a special key to remove it so it's not that simple. And yes, he came to Earth first and grew up in Smallville but ended up in District K after the Kryptonians arrived. I'll save the rest for the prequel though.