Would you mind if Mira's fate was retcon?
So let's say that if Mira gets executed and when Season 2 starts, Mira is revealed to be alive in either scenario. The one who died was a body double, perhaps the mother in the other cell who was made to look like Mira by Morgryn. As for how Morgryn convinced the mother to act as Mira, he could easily make a promise that he will provide for her boy.
If they decides to go this route, I wouldn't really mind. Sure, it is a bummer with the choice having no consequence, but if it means that we can play as Mira again, I would be happy.