Super exciting project! Looks like you're off to a really great start! You should also try to
sow some orchid seeds on the trees. I've had some success with this technique here in very dry Southern California. In theory, you should have a lot more success in humid and rainy Brazil.
My friend in Brazil might have some seeds available. I'll PM you his e-mail address.
It's pretty easy to pollinate orchids... but it requires quite a bit of energy for a plant to produce seed pods. So you want to choose plants that can afford to sacrifice some energy.
One orchid that I'd highly recommend making crosses with is...
Sophronitis cernua. Fiery colors seem to capture more attention than other colors. Plus, most importantly, it's pollinated by hummingbirds! So is
Guarianthe aurantiaca and
Prosthechea vitellina and
Laelia milleri. Ideally the hummingbirds will help create all sorts of
crazy cool combinations and the wind will paint all the trees, buildings, cars and people with orchid seeds that will germinate and produce so many more flowers for the hummingbirds to cross-pollinate.