How to export/import protected project resources

We need to send project updates to a customer, but we’d like to protect some project resources so they are not modified by the customer.
Apparently when we “Export” a project, the protected resources are not exported.
The option to send the complete gateway backup to the customer is not ideal since there are several projects in the same gateway and not all of them need to be updated.
Is there any other way to accomplish this?