If anything could and and would get Lorna’s character restarted, provide drama to as you say milk and tie her into the mythos much better you are right. I gave Bunn credit for instance for having Lorna and Emma interact, but their relationship outline for Cry Havok fell too broadly into territory already carved out by Jean/Emma that with adult Jean back I had the feeling there wouldn’t be much interest in following up on it.Jean and Storm are BFF’s who agree on most things and the audience is emotionally attached to that. It’s not going to be supplanted period. Jean and Emma are rivals in the personal sphere and the ideological sphere. That creates a window for Lorna and Jean as friends in the personal sphere, but rivals in the ideological sphere.
I also see the potential for Lorna and Emma as well as characters who agree on many things on the ideological side, but personally don’t particularly like one another.
I will say to be fair to The Gifted before I return to my sabbatical one of the best things The Gifted did at least for season one and a few parts of the half of season two is it highlighted how well Lorna as character does work as an ideologically complex character and how much it facilitates interesting relationships between Lorna and other characters without being redundant or ending up Lorna getting simply written to accentuate their story.
In terms of the comics though Lorna hasn’t been written with any real philosophical complexity since slightly before HoM (and I am not talking AU stories like HoM and it’s minis in there).
Prisoner of X has nice pictures and covers, but in the end Lorna is being written as a minor support character in the story whose theme simply works far better for other characters not Lorna.