I bought 2 souvenir replicas of the new Skytree tower in Tokyo. The player in Tokyo/Tokyo Bay just places it on their monster tracker with the larger replica representing Tokyo itself.
For a really portable solution, I would think the monster trackers could also be made into 2 card-sized trackers with the monster image splashed across the width of both cards.
For a really portable solution, I would think the monster trackers could also be made into 2 card-sized trackers with the monster image splashed across the width of both cards.