This bug has been around for years. Baktria and Pontus both have a bug where if you marry their starting faction leader through the character intrigue tab the spouse will always die within a few turns. This can be fixed/avoided by marrying another factions character through diplomacy and not use the auto generated character marriage. The problem is that finding other eligible faction characters is hard/rare, especially early game. The Baktria leader start is young and has a young child, his inability to re-marry makes Baktria's initial faction survival unnecessarily hard/annoying. Pontus is not so bad because the leader is old and already has multiple adult children with children.
Tested removing the death type and turns died before start for spouse character Agape from start_pos_character tables through assembly kit. 9 years everything seems to be working. They have another child together.

My problem is I want to use Athanasios' Ultimate Fixes which edit's the startpos as well. Is there a way for me to add my changes to an already existing startpos through the assembly kit? I know I can edit it through a PFM but I have not idea which array or which values I would have to change in that form. Thank you