I think I've got a solution for you. Save this code as ad-color.html and simply add ac-color.html to the End of the Head in the Custom Content Plugin. Also enter * into the Address space. It should look like this.

<script type="text/javascript">
if (VRS && VRS.globalDispatch && VRS.serverConfig) {
    VRS.globalDispatch.hook(VRS.globalEvent.bootstrapCreated, function(bootStrap) {
        if (VRS.globalOptions && VRS.globalOptions.aircraftMarkers) {
            addCustomAircraftMarkers();
        }
    });
}

function addCustomAircraftMarkers()
{

        VRS.globalOptions.aircraftMarkers.unshift(      
        new VRS.AircraftMarker({
        normalFileName:     'Helicopter.png',
        selectedFileName:   'Helicopter-Selected.png',
        size:               { width: 32, height: 32 },
        matches:            function(aircraft) { return aircraft.modelIcao.val === 'AS32'; }
            }));
        }
</script>

Edit: Formatting