Ball python eggs are pretty resilient...I wish I could find the picture I took last year of a clutch where I had to incubate a slug because it was stuck to a good egg. Throughout the process, it molded beyond recognition, but I got a great picture of this perfect 1/4" space of air between the seemingly random spread of mold and the surface of the egg. The mold grew all around it but due to the eggs active immune system, never actually touched the egg itself.

The bowl-top idea was great, and I'm sure that someone could engineer a lid that basically raised the ceiling in the center of the box in order to direct any moisture to the outer areas of the egg box.

The easier way, of course, is to avoid condensation altogether. This is another reason why I like the substrate method better than the no-substrate way - with substrate, I can have a much greater thermal mass in the egg box, which stabilizes the temperature inside the egg box much more so than what the no-substrate method would do. Water is a great conductor of heat and fluctuates in temperature much more so than 3-4 lbs of vermiculite.