What is the priority now? I think you are right that when it is developmental or teeth, you cannot do much. What do u want the most? Later wake up? Or longer night sleep? You did 4-ish A yesterday which was much shorter than the previous days and the days you got long sleep was much longer A.
If you want to shift wake up later, I would actually do 2 naps, then 9 bt to get him to sleep past this dreadful 5:30! That might be better for your holiday, just do whatever. Let him stay up and pass out himself, so you can enjoy a bit.