How to edit (and find) startpos fron 1212 AD steam mod

Hi all,

i already managed time ago to make some factions playable in ETW
Now I m trying to do the same for ATW but that time for the 1212 ad kingdom mod specifically

The thing is when I use ESFeditor or the assembly kit and search from the main campaign startpos.esf it s all about the vanilla faction
Because the mod is on team and on the workshop folder we only have big size .pack I m stuck

Anyone has any idea on how to access the startpos from a steam mod that edit the campaign ?

regards