Actually, I found that a simple pair of glasses changed Cavill quite up. Cav-El to Henry if you will
With that galoofy (aloof/goofy, sue me, I had to make up a word
) half-grin of his, I thought it really changed up his look. I'd buy that as a first impression.
But only as a first impression. They established that Lois is fully aware of who Clark is, so she becomes the solution to "Daily Planet Clark". She's a Pulitzer Prize-winning investigative journalist, she probably knows a thing or two about blending in.
They also have a huge opportunity to go more "local" with MOS2/WF/BvS. Clark should still be on "stringer" duty at the start of the film, so we can see him get a feel for Metropolis and blending in among the crowd. This is a very good chance for Henry to showcase some serious skills.
Point is, Goyer didn't "write himself into a corner" or whatever. He gave himself and the filmmakers an opportunity to reinvent one of the core elements of the Superman character.