One way you might do this is by asking on various international forums here and becoming 'known' through your contributions to discussions.

I'd suggest you first start on the very active forums and become easy with the strong personalities and opinions.

If you have a look on the Companion Plants forum you can see a posting from a scientist doing interesting work with tropical aroids in Florida. I found her to be very open and friendly. If her work is useful to you also then you could maybe follow her link and make contact.

In such ways you can put together your own network of international specialists for sharing and visiting.

In addition to familiar places you may also wish to consider making contacts in the Pacific nations and states.