rent a gcp instance for a bit, rclone mount your drive instance, create another rclone encrypted mount, copy from the unencrypted mount to the encrypted mount.

rent a gcp instance for a bit, rclone mount your drive instance, create another rclone encrypted mount, copy from the unencrypted mount to the encrypted mount. delete unencrypted content. go to your local pc and rclone encrypt mount your drive. now you have your linux isos and they are encrypted upstream