I do not think you would want to protect every JP at all times, it would get expensive very fast. What I do however, is have 2 stations ready to be towed where needed. While my play is very unorthodox (no military ships till needed) I rely upon such stations to save my ass until I can pump out enough ships to go on the offensive.
And Plasma Carronade works excellent in such situations, huge damage, cheap to research + jump shock makes short work of even superior enemy. About the size of destroyer in my fleet (20kt) it packs quite a punch and is not too expensive.