That's fine. In rare cases, changing stupid source material is good. Batman: The Animated Series changed Mr. freeze from the source material into an awesome villain.
The best solution to this would just be to use a different Ghost Rider. Alejandra works perfectly as Ghost Rider if they really want diversity, Blaze or Ketch if the want a more classic Rider. But, if they must use that version, giving him a motorcycle is the only way to make him a Ghost "Rider". Otherwise he's just a bad comic book idea put on screen instead of the good comic book versions.
Except it's not a "stupid" idea, and Robbie isn't a "bad comic book idea." His book was miles better than the awful run they put together with Alejandra. It's different,absolutely, but that doesn't make it either stupid or bad. But definitely different, which you apparently hate. Which makes this second part of your post really, really ironic...
Any one who hates people or wants to lock them up because they're different from them is evil. This SHIELD director (just like Gonzales, Mockingbird, mack, etc) is just an X-Men villain, except he hates Inhumans instead of mutants. No one who has similar beliefs is anything but a bad guy. A character doesn't come back from being a bigot, its one of the most obvious types of irredeemable bad guy. The only way they could be more innately evil is if they were a nazi or something like that.
It should be noted that while Mack was initially on the side that was fearful of Inhumans, he has since grown as a person. To the point that he has partnered with an ENTIRE TEAM of them, working closely especially with Daisy. He feared what he didn't understand. But as he's come to grasp the situation, his position has evolved. Hell, he even risked his life to try and get her back from Hive, very nearly dying in the process. If characters are never allowed to grow or change, or learn their lesson and change their minds in Mack's case, then what's the point of even putting them in the story? Mack's story is one of growth, of realizing he was wrong in his initial reactions and moving past them.