By the way, Iorveth and Saskia helping to assassinate Radovid instead of Ves and Roche could work as well since they both hold grudge against him for not wanting to recognize the pontar valley as an independent state and now hunting non-humans.
But there might be some issue with the follow-up since Djisktra would probably not try to kill a girl who can turn into a dragon within seconds. Overall, that Djisktra thing felt like some of the most bizzare things in the game plot-wise.
If they really felt like Djikstra should have ruled, this is how I would have done it:
Roche's path:
Let Djikstra kill Roche and Ves - Adda alive: Radenia wins, Adda rules alone. Djikstra "advisor".
Adda dead: Radenia wins under Djikstra.
Do not let Djikstra kill Roche and Ves - Adda alive: If {something}, Radenia wins, Adda rules, else Nilgaard wins.
Adda dead: Nilfgaard wins.
Iorveth' s path:
If Saskia alive: Djikstra dies. Adda alive: If {something}, Radenia wins, Adda rules. Else Nilfgaard wins.
Adda dead: If {something}, Saskia unites non-humans and the North, wins the war. Else Nilfgaard wins.
if Saskia dead: (like who would kill her really, but anyways)
Let Djisktra kill Iorveth: Adda alive: Radenia wins, Adda rules alone. Djikstra "advisor".
Adda dead: Radenia wins under Djikstra.
Do not let Djikstra kill Iorveth: Adda alive: If {something}, Radenia wins, Adda rules, else Nilgaard wins.
Adda dead: Nilfgaard wins.
I would have liked it this way much better : D