A big piece of this is my mistake. I ordered the Kaoko throttle lock for the Norge/Stelvio with the handguards, never really checking how the bar weights attach on my bike. As it turns out this model (STELHG) has a threaded end that screws into the end of the handlebar. Matching threads is is not what the end of my Norge handlebar has; instead there's a plug (pressed, welded?) with threads to match a slender bolt all the way through the end weight and hand guard. Rechecking the catalog, there appears to be a correct ended Kaoko, but it doesn't look like it has the handguard fitting on the outside.
This has got to be about the most trivial issue you can have on a bike. Has anyone done this?