I understand now, but unfortunately I have also remembered my idea will not work.
The inner weights sit free inside the bars, so the Honda bar ends are shaped to ‘lock’ onto the them. That way you can hold it still to remove the bolt, otherwise they will just rotate rather than loosen. The R&G sliders for Honda bikes have the same shape, but it is unlikely anything universal will not. So even if you can tighten them, they will probably never come off.
I would try contacting someone like R&G to see if any of their models for other Honda bikes will work with yours. I would think the bike specific aspects of them might just be the style and size rather than the mount. And that will not be any more of a comprise than using something universal.
Otherwise just replace the weights with some cheap bar ends, go for a ride, and see how it feels. Maybe the vibration will not be a problem that you do not need the weights.