Here is the perspective of my boss, the former Director of Applications Development at Oracle:
"I've never heard of software offered to enterprise that does not allow download of edits. If such a product were created, we'd consider the development incomplete and patch it right away, especially since it requires so little manpower and affects so many people. Correct me if I'm wrong, but it's a simple data mapping exercise, pointing to the updated data elements. I'd swag it at 2.5 person weeks max including development, testing, conformance to any development standards, and packaging."