The question I would ask yourself is, what will the children get out of 6 versus 2 months of traveling? And what will you get out it?
Kids at that age will probably enjoy traveling, and it is also such an adventure, but it is also exhausting for them and you. There will probably come a point when you hit the traveling-wall, where you are either all sick, sick of each other or sick of traveling or a combination. Are you flexible enough to come home or wait it out?
School at this age isn't of utmost importance, which is great, but committing to 6 months of regular school-work will also add to your stress, which ideally you want to minimise.
I raise these issues because we have friends with children doing something similar in a similar time-frame. When we last saw them, the parents were exhausted and, I suspect, depressed. It was a great adventure with solid planning, but half-way through, it has become a slog for all of them. The constant travel, budget balancing and looking after kids as well as navigating foreign countries with only English and google translate is hard enough work and I got the impression that the 6 months is way too long.
As an alternative, and what worked and still works for us (living in the EU) is having a base and making trips from there. A cheap apartment in a cheap city, for example.
I don't know if this helps. Travel alone is a great thing, travel with young kids can be fun, but taxing and as long as you are aware of it, you would probably be disappointed if you never did it. Just figure out your limits 😊