You can edit the template and then reset the zone if your zones have no customizations. This is not practical in all cases because zones may have customizations and this will remove those customizations.
Experienced system administrators should explore manually editing all DNS Zones from the command line. For instance, if you want to update the nameservers in all DNS zones from ns1.example.com and ns2.example.com to ns1.example.net and ns2.example.net, you could do so using customized sed and find Linux commands after backing up all zones in the /var/named/ directory.
SafeAdmin Certified system administration service providers are listed on the SafeAmin Certified Services page for your convenience.