Parts are always a problem for stuff in that area.
My step grandmother was from the Philippines, I have a fair knowledge of the area, but far from expert on its weather.
I seriously doubt any home built wind generator will be low maintenance dealing with the weather it will experience there.
From experience here, with the extreme temperature shifts, humidity, and general wide range of weather, nothing much likes it and I am always up to my ears in maintenance of this or that machine.
There is the extreme heat in the middle of the day, high winds, then that rainy season.
Off hand here is a short list I can see you would need to plan for.
You will have to build for protection from burnouts.. the heat can be there even with high wind. a brake would probably be a requirement in my opinion. An air core stator would be a melted and charred piece of dung in short time without one.
I would build a centrifical trip device that engages that brake until manually reset.
An electric release/re-arm of sorts that has to be manually activated once any unexpected storm had passed, so your not climbing that tower to reset the brake.
I don't think such a system is out of bounds of DIY, even in the Philippines
Also as Niall mentioned, ceramics would probably be best in that wet environment. Neos just don't get along well in humidity.
Nickle plating has failed for me on most any outdoor device I have employed them in. Smaller ones I have as a door holder in a cupboard below our sink are even very badly rusted, in only a few years ( hard drive magnets)
I also agree with Niall that a mechanical pumper and storage tank high enough to provide adequate pressure might be a more effective solution for the water issues. Just might need to be careful of contaminates, and growth of bad stuff in it, Solar heating it to reasonably high temps might deal with that? I am no expert on that matter, just rambling thoughts there.
As far as saving money on power bill..
What kind of KWH use per month is this farm using?
I don't know if any of this helps but just my thoughts.