> If the market value of a healthy forest is greater then that of palm oil, the forest will survive.
Sadly, It does not work like that.
Alive African lions have a economic value in tourism, they are still being decimated by external companies that hire local furtives to do the job. You could send every children in poor countries at the university and Translational companies and mafias still would kill the last lions and probably a few rangers to sell its bones in the black market.
If you pay poor countries to not distroy the forest you are just building a blackmailing system. First, a lot of this money will never reach poor people. Local people will be increasily frustrated, and in a couple of years the question will be: "Keep paying me or somebody will burn the forest". We would be funding accelerating the pressure to distroy rainforests (because you are funding the people that will distroy nature at the exact second that you will quit the area).
The same is happening in Europe, with modern environmental laws and millions of euro invested in saving big predators. Norway has like 50 wolves. Spain is paying farmers for not killing big predators (being paid for agreeing to respect the law, none less!), in national parks!. We don't have stable populations of wolves in any of our national parks in fact and talking about reintroduction is taboo, even when we have evident problems with the explosion of populations of wild ungulates and invasion of national parks by cattle.
After millions of money raining over this areas, we still find decapitated wolves hanging from trafic stops or floating in public pools "goodfather style, and people more angry than ever about wolves and asking for more money each month. We had the exact same mathusalem cow killed "by wolves" four times in four different places, and being paid four times. Is a scam.
Support conservationists or environmental police instead. This will trow much better results in the end.