How can I send a group message whereby only I can see the recipients?

If you want the recipients to be visible to you only, turn off "Group Messaging" by going to your iPhone Settings > Messages.  This will work as long as the message is sent by SMS.  A group message will be sent by SMS and not iMessage as long as at least one of your recipients does not use an Apple device.  To be certain that the message will always be sent as SMS, you can turn off "iMessage" as well.