The best way to push your processes back down into the Test/Dev environments is going to be exporting the Business Process XML files and importing them into the other environments.

I can't really see an easier solution because there's so many dependencies involved in the back-end data. For example, even the user and process ids are going to differ so a database transfer would pose a lot of problems.

10.4 is adding the "process promotion tool" which allows you to reassign data sources and other resources on import when a match isn't found; this is meant for moving into production more easily, but it can go the other way too, so if you move a process back into Test/Dev you can point it to the Test/Dev data sources and such.

My current process is to only make changes in production when it is a minor change, then if I need to work on a major update I export the "current" process and import it into the dev environment.