In my opinion the little black egg(LBE) is the best stop gap until a full blown wood fired oven. You will find a ton about them in the home oven section of the forum if you haven't already seen it. A LBE will probably not get you to full Neapolitan temperatures and cook times, but it will get you close, and unless you know Neapolitan pizza more then most you may find it's actually your ideal. Pies like the LBE can produce are actually what a lot of places here in the states sell as Neapolitan.