It definitely makes sense and you can do it. But note that backup-to-tape job doesn`t perform backup, but copies backup files to tape.
So you need to backup replication VMs before.
Another option is to use backup files as a source of replication job
. Means, you can backup the VMs on the production site, copy them to the production site using backup copy jobs and use the copied backup files as source for replica and to-tape job. Thanks!