Yes, there is a method like in RTW. Just move the characters to the same position like you did in RTW and go for it.
I had the same problem as above. I transferred the crown to a family member that was not auto-selected as the heir from my starting king. My starting king died and my computer designated faction heir become king. I am not running BGR. I am on savage AI, live long and prosper, 1 settlement type, next heir crown and permanent watch towers.
Ah, that straightens things out. Singling out that sentenced helped. Thanks.
Does this affect the AI's heirs?
It should work with on-going campaigns. Removing it from an on-going campaign will likely cause a CTD.
Hmm. Before the last changes I made in the mod it was incompatible with the old save games. But later it became more stable though I didn't bother to try to use it with an old campaign, so without a new test I can't say much. I'll give it a try when I got the time, meanwhile if anyone else tries it, please share the results