Ability to copy issues from one project to another but with the ability to perform maintenance on one which updates both copies

Because we use the projects to manage our unapproved change requests/requirements, I need the ability to migrate approved requests/requirements over to our development project at the point where we have received said approval. I'd like to keep a copy of the original issue in both places so that our project mgrs can track the issue in their project and our developers can track the issue separately in their project (they may want to change the issue type, priority, etc).

Would like to have the ability to make updates to the issue appear on both copies or on just one copy.

Would like to keep this separate from moving, which causes the issue to lose its original numbering and which takes it completely out of a project, or linking, which simply links related/duplicated issues.