How to remove 'router' option within a dhcpd group block

Hi all,

Does anyone know if there is a way to remove a router in a group block
that was set in a subnet block, in the dhcpd config file?

  subnet 192.168.0.0 netmask 255.255.255.0 {
    option routers 1.2.3.4;
  }

  group {
    # Don't supply a router at all.
    option routers 0.0.0.0;

    host ...
  }

Specifying 0.0.0.0 doesn't work, dhcpd still hands out 1.2.3.4 from the
subnet section.

Is there a way to tell it to drop that option completely within the
group section?

My reason for asking is that I have some devices that like to phone
home, and while I can block them at the router it would be nice not to
even have them try to connect to the router at all.

Many thanks,
Adam.
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