This flightpath is NOT compliant with the satellite data. eg the proposed flightpath crosses Arc 2 (1941:03) at either 6.2N93.5E or 8.5S92E, thus the required groundspeed you are proposing from MEKAR is either 141knots or 835knots. It is not possible.
The flightpath you have proposed is very complicated.
It is a poor match for debris drift or barnacle growth.
Whereas, the flightpath diversion to Banda Aceh is simpler and compliant with the satellite data.
I said very rough one, I really don't have the time to fiddle with the gazillion possible flight paths to Christmas Island just to make it fit the satellite data, debris drift and barnacle growth fits very good with the location behind the CI, here is another guy who came to the similar location 4 years after me
https://www.thesun.co.uk/news/792371...istmas-island/