Ability to "mark conversations as distinct" so that option to merge disappears?

It would be great to have a way to "mark conversations as distinct" or "keep separate" so that the option to merge disappears at the bottom of the conversation (if it's appearing to being with).

We've noticed use cases where we need to keep conversations distinct in a team/personal inbox for distinct client chains for different workstreams, collaborating on an email in a personal inbox for a case study from something that also is in a team inbox, etc.

To do this currently we need to manually remind people to not merge emails, which obviously is a bit inconsistent. So, some feature like this would be great. Thank you!