I know your planned cruising areas very well having made the trip back and forth from Cairns via PNG to Palau
and SE Asia
Also presently consulting on marine
projects both in KK and Subic, so know their weather
Your planned schedule is a bit tricky because of the West Pacific Typhoon /Rainy Season (July-Nov) enroute to Palau.
You are also missing the best cruising seasons for some of your highlighted areas so I would consider doing more of a reverse route
to keep you away from open water
passages during Typhoon season.
1. Aug. West from Darwin to explore Indonesia
2. Oct. North towards KK or Kudat, option of exploring East Coast
Borneo ( via Sipidan etc…)
3. Nov. Arrival Subic Bay Yacht Club Philippines
for provisions and economic repairs
before exploring Palawan to Visayas
4. Mar. Cruise
towards Palau/Yap arriving in light wind
transition period where diving
is the best because of nursery aggregates from the Rock Islands. (use Hinatuan Passage)
5. May. If time/weather permits… explore east coast
of PNG as you planed only clearing out of Alatau(Milne Bay) via China
Pass towards Darwin.
Then from Darwin you are in a good preparation location for ocean passage
Map shows this initial plan, but obviously subject to many other planning considerations I am sure you will have.
My own priorities would be to not get caught on open passages during Typhoon season and to avoid the worst of the rain, as well as to locate in places with better marine
support, prior to a big passage
Hope this helps