Jason Momoa may be firmly committed to his DC character, but lots of actors have taken multiple comics character roles and just like Kraven the Hunter will show up eventually, I’d imagine so too will Jason Momoa eventually join the MCU.
As for Jason Momoa, the actor obviously has Aquaman 2 on the way for DC; therefore, I don’t know if we would see him join the MCU anytime soon.
Although a villain role in theory wouldn’t be quite the commitment that a hero would so I guess we can’t rule it out.