Sounds like you're a betting man. I think I'd be inclined to go that route too. I think that there is a pretty good chance that the remaining ball bearing is lodged somewhere safe.
But it would also be a good idea to take steps to prevent it from getting sucked into the oil pump should it find its way into the sump. The pickup looks something like this.
If you were to get some rare earth magnets you can arrange them in the sump to protect the pickup.
If you estimate the position of the pickup (
blue) and then arrange the magnets (
red) like so...
...you could be pretty much assured that you'd trap any remaining balls as well as any other ferrous materials that might get down to that area and otherwise potentially make it through the screen.
Just a thought.
I think I'd also be inclined to pull the pan at the next oil change and inspect. If the ball is there you can really rest easy, and if not, it's pretty good confirmation that the ball is safely wedged somewhere in the engine.