Pete,
I'm new to the forum and a relative newcomer to figs, but my mother-in-law has a fig tree (type unknown, but thought to be from Calabria) in her yard that is at least 70 years old. What's more, it has survived a move and quite a few zone 6 PA winters uncovered. It is still very healthy and producing fantastic crops.
Like you I also have limited space so my policy is to save cuttings from the fall pruning in the refrigerator as insurance against winter kill.
Aaron