Not sure I like the idea of the Indigenous v NRL All Stars game having an added circus trick rule every year.
As a concept this match is gaining a lot of prestige and value - I'm not convinced it needs the party theme, and it may even detract from it.
I don't think this "kick for six" idea holds up very well. It's not a rule designed to create open play, just add to the tackle count. If a team succeeds in getting six more in their own half - then what? - how does that benefit the fans?
Sure there is a bit of a gasp when the kick is made, and we look to see whether they retain or lose possession, but that's it - he presumably goes to ground to ensure the 6 more tackles are banked rather than carry on with a risky pass or another kick etc. So we just get another set of the usual march up the field 6 tackles.
If introducing a contest for the ball via this "kick for six" option - with a possession risk/reward hanging on in it - then these used to exist via the play-the-ball and scrums, but RL decided the game could do without these contests.
If opening up attacking play for the team in possession in their own half is desired - then just legislate so that defending team's use their 5th tackle defence on every tackle. How? By restricting the number of defenders allowed beyond half-way eg. the team not in possession must have no more than 10 players in their opponent's half of the field at any one time.