Well, the NCP1402 has been discontinued by On Semi. That's kind of a huge bummer, as it worked really well, and the design of the Crazy Clock had reached a more or less steady state.

Unfortunately, it's sort of hard to pick boost converters for this application. The best I could find is the TI TLV61225. On the plus side, an external Schottky diode is not required. It just requires an inductor and input and output caps. Fortunately or unfortunately, it comes in an SC-70 package. That makes it tiny and fiddly to work with, but the price is reasonably comparable.

I've ordered some boards to try with the new design. I've got plenty of inventory of the current design, so there's at least no big urgency.