Hi Theodori,
I could stress that applying a DH croudsourcing literature project at a Greek school would be difficult due to Greek language. That means, it has to be in English in order to collect a variety of comments and proposals from all over the world. So, the Greek students must speak and write fluently.
But they could collaborate in Greek language with students national wide, or with Greek schools abroad . Otherwise, the English teacher could organise it during their lessons.
More or less, I believe we could try it