Idea: English for Toki Pona speakers course
Toki Pona is a constructed language and about as simple as a language can get. It has about 120 words and like 2 pages of grammar - it can be learned overnight.
http://tokipona.org/ <- has links to lesson sites from which can be learned.
The idea basically is whoever isn't billingual, but still wants to see how the incubator works for real, could take some time to learn Toki Pona (a week at most) and then could apply to contribute for Toki Pona > English (or another possible language if they are better at it).
What's even better is that this would require no additional coding from the Duo staff.