I voted Penrith, but Canberra was also very good.
I like to concept as a one-off or perhaps limited to one or 2 matches, and not more than 4 teams.
You want to keep it special, not make it routine.
Team can and should do other special occasion jerseys, again, probably no more than 1 or 2 special jerseys per year, but they do add interest, and there are probably some fans who will want to collect them.
The signed editions can always be auctioned for charity, and that is a good thing.