I think the Japanese version of the contest is really a great idea and I don't think anyone would rebuff it. It is also a turning point that could pave way to the introduction of other versions - like Spanish, Chinese, etc - which would ultimately expand the horizon of this "comment challenge" to other channels and give room for those who don't understand (speak/write) English to contest.
More so, the Japanese will be able to communicate in their dialect with ease, knowing fully well that that's the language they are more familiar with.

I think I have some ideas on how to bring this contest to other communities. Firstly, is to approach those who are from non-English speaking countries and/or those who are familiar with other languages like French, Spanish and Chinese. Then inform or tell them about the contest and the benefits they will derive. We could start from two countries then, gradually, others could be incorporated. With time, this contest would go global and help dozens of people and even more donors would surface.

What I love about this challenge is that it has been a means of helping and supporting newbies to grow in this community. The challenge has also helped people develop the ability to comment thoughtfully and genuinely while still making new friends in the process.
However, one thing I dislike about the challenge is that only two people will benefit from the challenge. I think provision should be made for third position if not more.