We could maybe just have various LG members play games against each other. Top five players make the team.
If we could get a sixth person for a Team Manager, they could arrange all the tournament sign ups and stand ins. Or, since a lot of users just got it, it can just be a for-fun kinda thing to play in groups of five in pubs/bots.

But for it to be any fun, we'd need at least five people interested in throwing down some LG clan tags and such.