I have been talking about the fiance line with one of the already established characters on the site though nothing is set in stone. If anything Jack was just going to be the 'gentleman caller' and see if they meshed the right way. However, as said, it's still technically open if you are interested.
Janet Montgomery is amazing, though I feel she may be a little too old/smart seeming for the line. I think Jack would have gone out of his way to find someone a little vague and more of a giggly girl for the false marriage moreso than someone capable and smart.
If you still want to have a plot, then let me know.