It would still be quicker if the changes were just applied to all the selected variants as the edit is made.
Actually,no, this is of no use at all. I need to edit a single metadata field on my selected variants. The above copies all fields.
I complained in another post on this forum about how Lightroom workflow was better than Capture One's. This is a good example, I think. Bart's solution is fine but you kind of don't want to have to think about this stuff, it's a distraction from your main thought flow. You want it to just happen. Workflow design is in the details.