The innitial crash was in fact the wrong precache, silly me, thank you Andi67.
As for the model change I gave up on replacing the pills attached to the body bc - unlike Silvers, Lux, Marttt and all the other pros - I am too dump to figure out how this stuff works with all this attach entity decoy stuff hahaha
I thought that it is possible to "just" replace the pills that lie on the ground, after the survivor dies but unfortunatelly it is not working as expected.
I only managed to replace all the pills on the map with this approach but not the pills that lie on the ground after death, even though I dont understand the difference between those pills.