Another way to improve viability is to made contact with people and institutes that you mention. This can be as simple as sending an email. But it demonstrates that you can do what you describe.
In case the part of the application involves a budget, the evidence is also important. Any program-related expense outlined in a budget has to be backed up by printouts of ticket prices, course tuition, and room and board costs. The amount of support is determined by the sponsoring organization.
Finally, the issue of language: most of the world's languages are not taught at universities in the U.S. You will not be expected to presently having a command of Mongolian or Swahili. Finding a tutor, private course, or even self-study materials and describing these efforts in an application can demonstrate an earnest commitment to language study.
Fellowships and Scholarships. Five Myths:
1. It is for social science and policy people. Many sponsors encourage applicants from the arts and hard sciences. It can include dance, biology, music and engineering.
2. It is for doctoral candidates only. Fellowships tend to be for postgraduates. It includes PhD candidates.  Scholarships are often for undergrads or recent graduates. Very often sponsors at advanced study have related program for junior scholars.
3. There are some limits for participants. Participants can go to certain countries and regions only. Sponsors have geographic limitations. The range of programs ensures that almost anywhere there is a potential destination. It is a question of finding the right program.
4. It is for participants who are fluent second language speakers only. Some sponsors require fluency prior to departure. Others will fund beginning language study as part of a scholar's program. It is a matter of finding the right program.
5. There is no need to apply for those who are not the part of a university. Major programs, especially Rotary and Fulbright, accept and encourage at-large applicants. Other programs are available to recent graduates as well.
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