Since Backup Copy jobs are copying data from source repository to the target, you can use any copy of the repository as a seed.
For example, you can make a copy of the local repository to USB, ship it to the remote site, copy it to its final destination, then configure that destination as a repository in the Veeam console. Once done, you create a Backup Copy job and choose the target repository and map it to the specific backup. Even more, this seeded backup will be used to populate the global WAN cache on the target side as well (this happens automatically during the first run if the cache is not yet initialized). This will take some time and use some disk I/O on the target, but will use almost no WAN bandwidth at all.