Set for the baptism? Why not get married too?

As one who in the course of baptismal preparation classes routinely meets couples who have been married in a civil ceremony (if at all) and who are looking to have their child baptized, this article about an initiative undertaken by the Church of England offering a two-for-one service of wedding for the couple and baptism for their child caught my attention.
I often try to take advantage of the occasion of the baptism as an opportunity to bring up the possibility having the couple enter into a sacramental union, but question whether this approach is wise. However, I believe that there is something of value to the initiative itself.