Kuririn ought to take it with exteme-diff if giving him the same level of Ki control as Goku did when he fought Nappa/Vegeta, since Kaioken x2 won't be hard to maintain. If it's his Ki control at the time though, I don't think that's going to cut it.
It's not just the ki control that matters for Kaioken, it's also the toughness of the body which is why Goku can withstand higher levels of the Kaioken after training for less than a week in the gravity spaceship. Kuririn gets raped unless strain is eliminated imo, he'd probably wreck himself in 10 seconds