[Samba] Existing DNS zone and Samba4 DLZ

[Prunk Dump]

Hello !

I am the network administrator of a French high school. I have already
configured a BIND9 server with dynamic DNS update from the ISC DHCP
server for my zone :

lyc-guillaume-fichet.ac-grenoble.fr

And I would like to add a samba4 server in this zone. How can I add
the samba's DNS entries to this existing zone keeping my previous
static and dynamic entries ?

I can't use directly the SAMBA_DLZ module because it try to create a
new zone of same name so the bind server won't start anymore.

It is possible to rename the samba DLZ zone and forward the unknown
entries of my zone lyc-guillaume-fichet.ac-grenoble.fr to the samba
DLZ database ?

It is possible to add manually the samba DNS entries ? (I don't really
need the kerberos dynamic DNS because the DHCP server do this job)

What is the best way to do this working ?

Thanks !