@sim @jfperusse. - sorry, got my suggestion hat on again. A thought hit me whilst I was finishing my last post.
Consider this approach - all assets used by your project are held in the project folder of that name so all assets should be easily addressable.
When you wish to export/compile the finished project,as part of the compilation, Codea asks the author if they wish to sort the assets into appropriately named folders, then the compilation proceeds modifying addresses of the assets appropriately within the project folder.
I think that should simplify asset management.