I'm a little confused about the source of the template, if I may put it that way. What this would suggest is that the normal procedure—if this is what this is—is to have the subcommittee on agenda and procedure be as described, having four people with all four parties represented.
I, myself, have not observed that you, Chair, are such a retiring fellow that the views of your party have gone missing in action when you've been asked to present them. This is simply a committee that has to have all its decisions ratified by the full committee anyway. I think for proper functioning, you perfectly well represent the views of your party and your government, and a four-person committee would be a perfectly reasonable thing to have.