It might be an idea for playmobil to release a series of sets that focuses on specific countries, focusing on something that could increase strong sales localy but with things that may not be nearly as popular in other parts of the world.
These sets could be available everywhere, but in much greater supply at the target country.
Some examples:
Confederate and Northern troops of the american civil war could be released in the United States, as part of one western batch that pits them against each other. All of it could be available at DS across the world, and stores outside the US could have a selection of it available but not all.
Sure, some troops are available in DS now but the average joe does not look there. And this is exactly something that could really help increase playmobil's popularity in the United States.
For the United Kingdom, additional redcoat sets could be released. Maybe including a little regiment with a drummer, flagbearer and a captain on horseback. Or maybe even a ship of the line.
For germany, restyled and updated Nuremberg guards seem like a perfect choice. They are obiously Holy Roman Empire troops, and that is from a period the germans could be proud of.
For the Netherlands, I'd suggest a Fluyt ship with its distinctive Dutch design, and including pike and shot era troops and sailors.
For spain, a galleon including Hernan Cortez and other brave explorers would be an obvious choice.
Maybe including a seperate little set with conquistadores.
For Italy they could go with additional Roman sets or something from the reinassance, like a Venetian trade ship or Leonardo's workshop including inventions.
For Greece, they could honour the olympic games by creating sets around the ancient olympic games including a classical age Gym.
For Scandinavian countries, a grand hall could be released filled with a viking king and many of brave vikings and a long table with benches for them to drink, eat and brawl around. For this they could have helmets without horns, to be more accurate.
All of it would be available everywhere, just more through DS or more limited outside the country its aimed for.