Is there a way to include the proxy in /etc/cobbler/dhcp.template so that it gets rendered into the finished dhcpd.conf?

Here's what I'm trying to produce:

We need to cobbler-boot systems worldwide, and we have squid servers located around the globe to help cache. We want to have our systems know about these squid proxies during their setup so that their dhcpd.conf entries look like below. We also push the 01-* file to the proxy so that it can be picked up from there during the pxe boot.

:
:
subnet 192.168.19.0 netmask 255.255.255.0 {
    option routers        192.168.19.1;
    option subnet-mask    255.255.255.0;
    range dynamic-bootp    192.168.19.240 192.168.19.250;
    default-lease-time        21600;
    max-lease-time        43200;
    next-server            192.168.1.45;        <- This is our cobbler server
}
:
group {
    host generic23 {
        hardware ethernet 01:02:03:04:05:06;
        fixed-address    192.168.19.149;
        option domain-name-servers    192.168.19.2;
        option host-name "bs101.foo.com";
        option routers 192.168.19.1;
        filename "/pxelinux.0";
        next-server 192.168.19.107;        <- This is the squid proxy
    }
:
}

Done this way, when the installation completes successfully, Cobbler erases the host entry and the system goes back to using the master next-server value, bypassing the proxy.

I've tried using $proxy, but that doesn't work. Is there a variable available to me within dhcpd.template to insert this? I can see that it's known using "cobbler system dumpvars --name=bs101" but I can't figure out how to get at it.

Thanks!