One way to do this would be:

1.  In the Volund prefab, select the CameraEquipmentAvatar, create a new tag called AvatarCamera, and set the CameraEquipmentAvatar GameObject tag to AvatarCamera.

2.  In UIMainPanel.cs, add/change

    [HideInInspector]
    private GameObject[] inventoryCams;

    private void EnableDisableAvatarCameras(bool enableIt)
    {
        if (inventoryCams == null)
        {
            inventoryCams = GameObject.FindGameObjectsWithTag("AvatarCamera");
        }

        foreach (var cam in inventoryCams)
        {
            cam.SetActive(enableIt);
        }
    }

    private void Update()
    {
        GameObject player = Player.localPlayer;
        if (player)
        {
            if (inventoryCams == null)
            {
                EnableDisableAvatarCameras(false);
            }

            // hotkey (not while typing in chat, etc.)
            if (Input.GetKeyDown(hotKey) && !UIUtils.AnyInputActive())
            {
                panel.SetActive(!panel.activeSelf);
                EnableDisableAvatarCameras(panel.active);
            }