Hmm, good point. But is there anything they need to post other than preferred generation/tiers (and maybe battle skill, but the clan can test them if they wanted to)? Time zone possibly, if that matters.
Wait list would be fine in my opinion. Right at the moment, I doubt any clans would deny anyone due to activity unless they don't like the user or something. If the wait list doesn't work for them, they could just choose a clan anyway.