Adding Additional NIC to LTM VE

Sure, you just need to change the VLAN within the vSphere interfaces to be 4095 (which means to vSphere - pass VLAN tags directly through to the VM), then create the VLANs you need within the VE - the names don't have to be consistent with the environment outside the VE but the VLAN numbers/tags must be, and associate those VLANs with the 2 VE interfaces as you require.