You can do the bearing by releasing the steering column tube from the clamp bolt in the top of the steering box. With ignition switch and stalks removed, the column clamp on the bulkhead released, the outer column slides out, bringing the bearing with it, and leaving the inner column undisturbed.
You'll need a long drift to get the old bearing out of the outer column, and I used a socket to push the new bearing into place. It's rather a tight fit.
With the outer column removed, I fished some of the (tiny) ball bearings out of the steering box upper ball race using a small telescopic magnet. I took the side of the steering box off to fish out any remnants from within the box, so, I needed a new gasket for that. Obviously, you'll need to set up the steering box again - I would argue against trying to remove every last bit of play, and argue for making sure that the steering box runs smoothly.
If I were doing the job again, I would prepare a sponge / foam washer to fit in the outer column, and leave some clearance for the inner column. This would then catch the falling / failing ball bearings before they reached the steering box if/when the bearing fails again.