If you read the few reviews on the android version of the game, they are not very favorable. Based on what I read, I wouldn't even try it.
Don't get me wrong - I don't think the original idea is a bad idea. I just think it would take a significant level of resources to make something that would be used, given it would probably only be used by a small subset of the worldwide population (but I'm not a programmer so may be speaking out of ignorance).
Since this is an unofficial user-to-user help forum, you could post your idea on one of the church web pages (perhaps the one that lists the current church apps). At least that post will be forwarded to the department responsible for decisions of how to use the resources. There is no guarantee that posting here will get the idea to the church.