Unfortunately I think we will not see completely reworked questline at least in acts 1 and 2 because this will need an enormous amount of work to implement her "new" story into "completed" acts. As act 3 is very "work in progress" in actual state, it makes complete sence to add as much content as possible here(and this applies basically to every character and location they want to update).

The option from Sunriders Destin with fixing her "automatically" in avernus in the epilogue is also a very possible option, because this is an easiest way to do that. Basically epilog cutscene and few lines of text.

I hope for the first option for sure.