Reeves and the MCU?
Kevin Feige is and has been keen on getting Keanu into the MCU. After some thought even though Reeves is no spring chicken I could see him cast as Namor the Sub-Mariner.
He would have made an intriguing Black Bolt but a non-speaking part is a problem for any actor working today. I'm surprised with Vin Diesel and Groot but indeed that was a bit different role but Vin really sold it.
Yes. Reeves would be a good Namor and the closest to a Jason Mamoa type casting as Pacific Islander that has an affinity to Asian audiences.