First, BlueZone VT doesn't support to select a connection via the command line. At present, all override fields for connection in the command line would go to the first connection in the connect list of the profile. On the other hand, the connection opened by BlueZone VT is always the active/selected connection in the connection list of this profile. So, even though specify /H in the command line, if the active connection isn't the first one, this host /H points to would not be connected. But we will consider this requirement in some future release.
Second, the variables in /1, /2 etc in the command line can be used in BlueZone Script (.bzs file extension) only. Look at Use variables in scripts