The restore process will require you to restore a backup chain from the tape first, and import it to VBR afterwards.
You can also setup File-to-tape job to use masks
so that the job copies only vbk files at the end of the month. To prevent the job from copying all vbks you can leverage pre/post job scripts
functionality - write a script that changes extensions of vbks or/and vibs that you don't want to be copied to tape and use it as a pre-job script. Use another script that changes the extensions back to normal once the job has finished.