Bind 9.1 As SOA with Windows 2003 DNS Server

[Skywalker]

Currently in an NT 4 domain with a Windows 2003 DNS server.  The Bind
server is the SOA for the zone.  We plan to keep the BIND server as the
SOA. The BIND server has multiple interfaces, so it is serving DNS
internally and externally on our network. Firewall rules block
computers from performing dynamic DNS updates to the BIND server. We
want the dynamic updates to happen on the Windows 2003 DNS server.
Network traces prove that the computers only attempt to update the BIND
server after performing an SOA query. Obviously, we are not using
Active Directory Integrated DNS nor do I know at this point if that
will happen.  We will have a Windows 2003 domain controller in the next
couple of weeks.  When we try to run dynamic DNS from an XP client, the
computer cannot register itself on the Windows 2003 DNS server as it is
not the SOA for that zone.  We have proved that the computer can
register itself on the Windows 2003 DNS server, if the Windows 2003 DNS
server is the SOA for the zone.  There are no plans to remove BIND.
Does anyone have a solution? Any information would be helpful.