I don't want to sound pro-Tyrion/Sansa because I'm not. But I believe there's a reason that Martin is keeping it in the audience's minds. By the time they meet again, there's going to be major character development on both sides and there was suppose to be the five-year time jump which would have made Sansa 17 or 18. Their relationship would have been on much more palatable ground for book readers to get behind it.
Virtually all of the Tyrion/Sansa scenes in the show happened S3 and S4, and then it's dropped until they're reunited in S8. Even then, there was no definite conclusion to it. I think it was simply a case that D&D didn't want to write romantic scenes for Sophie Turner and Peter Dinklage.
As for their marriage in GoT: Tyrion is whitewashed in the show, the writers didn't want any extra grief coming Sansa's way for being too anti-Tyrion, so the entire marriage was written in a more positive light.
Like you said, the writers used rape as positive character development. What they might find empowering is completely different from what most people find empowering.
As for Sansa finding love again, there was almost literally no one who could have been an acceptable choice (for the audience) in the last season. Either they were too old, related to her, or would have been completely out of left field. I guess she could have had a casual hook-up with Pod.
The fact there are so few romantic options available for Sansa at the end of the story, is once again something that I think suggests Tyrion/Sansa.