This is typical bush league Paramount crap. Chris Pine's performance in Wonder Woman was so damn good they could have fast-tracked any Trek movie with him in it and gotten a hit simply by riding its coat-tails.
Hemsworth, while not having many hits outside the MCU has superstar name recognition. He'd be a major draw.
Before Beyond came out they said they wanted a MCU caliber film franchise.
Paramount, take a look at what the Fast and Furious franchise did. Instead of scrapping and rebooting, they built on existing characters and lore. They made previously awful movies relevant and fun to rewatch just because even casual viewers wanted to recall how this or that character joined the gang.
If you're going to make a story about fathers and sons, maybe get Alice Eve back so that Kirk can have actual character development and David Kirk can be born. Maybe get Sofia Boutella's Jaylah to take the helmsman position since Chekov sadly cannot appear. Use the previous movies to your advantage. Don't just say "that wasn't a huge success, let's ignore its existence."
There's a reason Infinity War had 97 characters. It's because they spent 20 movies making 97 characters interesting.
Maybe try to pay Captain Kirk what he deserves and build a franchise from your three previous films.