I would definitely date and marry Klara but I'd be the most toxic, paranoid, and possessive boyfriend she'd ever had. I'd make her feel like a queen and make her addicted to my positive reinforcement. It's the only way to keep a woman like her in her best behavior.
I'd break her with compliments and constant monitoring until she can't conceive of her routine without me intruding, for good and for bad. Going about her day without me raping her rotom phone with messages would feel unnatural to her.
I would gaslight her until she needs my daily input to remember she's deserving of rights, which I would revoke and give depending on how loyal she is. I would mix it up every once in a while so she has to double guess herself and work extra hard.
"This curry tastes like shit! Did you took a shit on the plate you whore? After all I've done for you?" And then I'd throw the plate on the wall. The curry was perfect, the type of curry you could serve in a 5 star restaurant, but she can't know that.
You call me a cuck? I'd make her scared of talking to other men.
"He started the conversation? Do you think I'm retarded! Give me your clothes! You're sleeping on the backyard today!" Actually, he did. And I would know. But this would give me a chance to nurse her back to health after a night of sleeping naked under the rain. I would feed her porridge, and read her storybooks featuring slowpoke like when she was a little girl, and listen to her music at a reasonable volume.
Whenever she considers breaking up of cheating she would remember her days as a failed idol, as a failed gym leader, as a failed trainer, and then think back to how I would dote upon her, how I would spend days working on the perfect room just for her, how I would nurse her back to health, how I would praise her cooking when she got it right, she did most of the time but I didn't tell her, and regret even considering it.
It's regrettable that it has to come to this but this perfect creature shall remain mine.