I'm positioning myself to Tokyo on a redemption and wish to do 3 separate trips, split on the LHR legs. This is my first foray into advanced ticketing as I'm hoping for some advice or recommendations.

The goal is not just to maximise TPs and miles but to explore new cities and cultures. I currently have what appears to be a valid route. In my opinion slightly too focused on Australia. I would love to visit India but this seems impossible with my routing. My plan is also to visit Antartica which is possible via SCL or EZE, I could not get closer.

NRT-KUL-DRW-BNE-PER-AKL-SCL-IPC-SCL-EZE-UIO-MAD-LHR-MCT-LHR-HEL-NRT

46k miles.

In D this arrives at a tease over 1m JPY - does this sound correct?

I've also noticed that some flights show no availability, or force to route me via another hub (so +1 segment). This is even though I know they fly direct on that date. One example is AKL-SCL. Any idea what it's doing (have checked on EF and it shows availability..)?