What if Cersei and Jaime get an Olenna like ending?

Let's say Cersei locks herself up somewhere, with guards outside. The guards are killed at the end and when the door is finally forced open, Cersei is surprised to see Jaime.

Jaime brings with him two vials of poison, one for each of them. Probably tells her that his life would mean nothing without her going forward, since a part of him still remembers what they had together, and it's too late for him to contemplate life with another woman at this point.

Cersei accepts the situation and recognizes that this is a better way to die than say, being burned alive or by any other common death sentences. They both drink poisoned wine and die together.

This could be a good ending in my opinion, because even if Jaime did walk away earlier, I don't think he would wish a horrible death for her. He would recognize that she would certainly have to die, but takes it upon himself to give her a better end.