This is kind of a deal breaker on purchasing Filemaker, for me. I have 9 more days on the trial.
That's a sad thought. FileMaker is so incredibly powerful if you just take some time to learn to develop. What you want is probably pretty simple, and with a few hours being mentored by an experienced developer, you could probably get all you wanted in functionality for contact management.
That said, you might be better off looking in the "made for filemaker" store:
There are a number of solutions there for contact management and one might meet your needs. AFAIK, there isn't really much "augmenting" solutions out there that are marketed to work with the starter solutions.