Wow, thank you for the paper!
I admit, this would be an absolute dream project of mine.
Having a flourishing Lasius niger or Myrmica rubra colony which is also host to a parasitic caterpillar.
Sadly, most of these butterflies are endangered in Germany, so sourcing them will be a problem.
I am also not an entomologist-
so even if I find a host colony of Myrmica rubra in my parent's garden or our orchard, I do not think I will be able to determine the species of the caterpillar and I think I would be a bit afraid to cause harm to an endangered animal, just to satisfy my curiosity.
But my fingers are definitely itching for turning over the rocks at my parent's place and the orchard and peek into the Myrmica nests.
However, right now, I do not yet feel confident enough for keeping a more challenging species like Myrmica rubra (I have seen they are quite tricky with their heating and humidity requirements)- I am aware that I should gain some experience with my beginner level Messors first before daring to attempt keeping them.
So for now, I think peeking will be the only thing I could do.