the most effective solution will be push config as it allows you to control what is moved between sites while you have a master "control" node that is what owns the configuration the secondary solution will be pulse one; however, it relies on communication from the other devices. if push config does not work, i am not sure pulse one will be viable for your environment barring those two options, the next best solution is strict change control and manually make the changes on the devices or make the change on one device, export that XML change, and import it to the other devices. the final solution will be to make changes, export the user.cfg, and then import it to the other devices
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