In that case it would be best to just stick to the current one-off game(s) format. After all, we've already found out which teams should be playing in the 'final' because we've had both the SL and NRL Grand Finals.

Do they really want to expand it, or perhaps just have more games?

We could have the World Club Challenge as it is, but also a 2nd

League Winners Trophy AND

a Cup Winners Trophy (Not sure if the Aussie's have a Cup Comp anymore).

Still 3 extra weeks, would mean the season doesn't finish until nearly December by the time the internationals are over, and some players would have played 40+ games. How would an annual Club World Championship work in an international WC year?

Well my system would give you your three extra games, without exhausting any one side, as they'd all just be one-offs for each club involved!

three extra games could be found.

We drop the exiles game, look at some clubs entering the CC a round later etc.

Think we'll have to agree to disagree on this The Exiles game does need dropping, and from next year under the new system the top 12 are entering the CC from R5