I have now extended my research to also include those Swedes who fought on the Western Front, fell there and were buried there, but later on reburied in Sweden, as their relatives wanted their sons to come home to the mother soil.
You will find it in the “soldiers” link in the main menu. So far I have only located photos of the headstones in Sweden from three of the soldiers, but I hope I will locate more of them, when visiting their old home parish. Hopefully they will still be standing there.