I vaguely recall someone doing a challenge like yours back when I was on Steem. They weren't allowed to stake, nor to accept gifts, and many other such prohibitions during the challenge. They had to earn the crypto the hard way, by just posting and replying to posts. Is your challenge going to be something like that? Or is it just a "earn crypto on HIVE however you can" type of thing? Either way, it sounds like fun!