There is a simple solution that is cheap as well.
Have the elink connection on a private node where all telemetry is off.
 ; Echolink -R
rxchannel = dahdi/pseudo
duplex = 0 ; 0 = Half duplex with no telemetry tones or hang time.
hangtime = 0 ; squelch tail hang time 0
althangtime = 0 ; longer squelch tail hang time 0
holdofftelem = 1 ; Hold off all telemetry when signal is present on receiver or from connected nodes
; except when an ID needs to be done and there is a signal coming from a connected node.
telemdefault = 0 ; 0 = telemetry output off.
telemdynamic = 0 ; 0 = disallow users to change the local telemetry setting with a COP command,
linktolink = no ; disables forcing physical half-duplex operation of main repeater while
; still keeping half-duplex semantics (optional)
nounkeyct = 1 ; Set to a 1 to eliminate courtesy tones and associated delays.
totime = 180000 ; transmit time-out time (in ms) (optional, default 3 minutes 180000 ms)
idrecording = |ie ; id recording or morse string see http://ohnosec.org/drupal/node/87
idtalkover = |ie ; Talkover ID (optional) default is none see http://ohnosec.org/drupal/node/129
You simply connect your primary node to the echolink node and no telemetry will broadcast on the elink node/network. And you have a bit more control of it.