DHCP trust/untrust on EX3400 platform

Hi all,

I am configuring DHCP snooping on some EX3400 switches. Once it's turned on, access ports are untrused (by default) and trunked ports are trusted (by default).

There are override options to make an access port trusted, but I don't see an option to make a turnked interface untrusted. I have a valid reason for implementing this config. I can do it on non-ELS platforms (like the EX4200) with the following commands:

set ethernet-switching-options secure-access-port interface ae0.0 dhcp-trusted
set ethernet-switching-options secure-access-port interface all no-dhcp-trusted
set ethernet-switching-options secure-access-port vlan all examine-dhcp

However, no override exists for a trunked interface on the new ELS platform:

{master:0}[edit]
root# ...ns dhcp-security group GROUP-EXAMPLE overrides ?
Possible completions:<[Enter]>            Execute this command
+ apply-groups         Groups from which to inherit configuration data
+ apply-groups-except  Don't inherit configuration data from these groups
  no-dhcpv6-options    Make this group of interfaces not to add any DHCPv6 options
  no-option16          Make this group of interfaces not to add option16
  no-option18          Make this group of interfaces not to add option18
  no-option37          Make this group of interfaces not to add option37
  no-option82          Make this group of interfaces not to add option82
  trusted              Make this trusted group of interfaces
  |                    Pipe through a command

{master:0}[edit]
root# show vlans
VLAN-CLIENT-TEST {
    vlan-id 100;
    forwarding-options {
        dhcp-security {
            arp-inspection;
            group GROUP-EXAMPLE {
                overrides;
            }
        }
    }
}

How do I override the default behavior on a trunked interface?