Hi there @gdollardollar -
One approach is to ask your team members to turn OFF the Automatically persist variable values general setting, and in cases where you want team members to overwrite those values, toggle it back on.
Another approach is to maintain immutable values as a collection variable (instead of environment variable), and only grant collection editor permissions to certain team members.
If neither of those options float your boat, upvote this feature request and/or chime in with your own use case: https://github.com/postmanlabs/postman-app-support/issues/6596
As a side note, there are 2 different roles for workspaces, but no difference that impacts your use case here.