Cuba and the Soviet Union started insurgencies in several countries in Central America. Blaming the US for its attempts to counter this is disingenuous.
That is the easy part. There is a good model for shared infrastructure - a private corporation is established, all the local companies buy a share then the shared company builds, owns and operates the actual infrastructure. The same thing works for funding long-term research in everyone's best interest. A shared research corporation that all the local businesses can buy into. They can be guilted in to a small contribution and the research can happen at a slow-burn to generate results over time.
To me the bigger challenge is who would pay for dumping large numbers of irradiated bugs.
Besides, how you can be sure it does or doesn't happen? The world is large and complicated; and basic research gets nearly no press and is very hard to statistically quantify. Where would you look for proof in the positive or negative?
It's also striking how much these efforts were made harder by US foreign policy and involvement in the wars of Central America, and are still made hard because of our poor relationship with Cuba.