Deploying SSRS reports on an "Air Gapped" report server without SSDT?

Whats the simplest way to deploy multiple reports (.rdl) along with the respective data sources to a machine which cannot be connected to from Visual Studio? I can only place files at a given location, connect to the report server via remote desktop and execute them. I am not permitted to open firewall ports, or establish any other sort of connectivity between my machine and the report server. One way is to manually upload the files one at a time, which I wish to avoid.