Branno..
I know this may seem obvious and perhaps unhelpful but the only way to run a business in the R.P in my experience is to be there and manage it yourselves.. Any other arrangement is usually an exercise in futility in most cases.
Most absent Filipino landl owners stick posts and barb wire around the boundary sealed with a gate , padlock and of course a "trespassers will be prosecuted" warning.
That is what I advise you do for your future sanity..
They will rant and rave and call you an evil,greedy land grabbing foreigner for a while but this attitude will eventually pass.
What ever decision you make,I wish you both the best of luck.
BTW.. How long has your wife owned the land? Did she buy it or was it inherited? Is it tax declaration or titled land?
Cheers,
Fred.