"In the novelisation, it is faintly and disturbingly implied that Unkar has sexual designs on Rey". Do you have examples of this?
The closest I could find:
“While she knew [Plutt] looked forward to their occasional business dealings, she could not say the same. […]
Unkar Plutt […] was delighted to extend their encounters for as long as she could stand it. He always took time when examining her pieces, letting his gaze rove slowly over everything she put before him, making her wait. Only when the bounds of common courtesy had been markedly surpassed did he deign to acknowledge her presence.
She did not give him the pleasure of seeing her disappointment. […]
“That’s my girl,” Plutt commended her.
Not replying, she turned and left, moving as quickly as she could without alerting him to the fact that his presence disgusted her. She could feel his eyes all over her until she exited the big tent.
“Why didn’t you offer [the BB unit] up together with [your other findings]?” Plutt was drooling. Normally that was a cue for her to flee while she still had control of her stomach.
“That’s my girl.” His tone oozed something more than false possessiveness. There was an eagerness in his voice that was something new even for Unkar Plutt.
He also refers to her in a narrative sequence as the “lovely, but disrespectful Rey.”