How about this instead:
"Because he manipulated the Force itself to create life. My grandfather. Then, perfected in darkness with you. You’re his chosen heir… a Palpatine.”
"The Emperor told me to fight you so his strongest heir takes the throne. But he’s unaware that we’re a dyad in the Force, Rey… a bond, not of shared blood, but power. We’ll kill him, and finish what Vader started, together…”
This way it’s up to interpretation whether Anakin’s bloodline was even infused with that extra dose of the dark side compared to the average Force-user, giving more significance to Rey’s own origin. I think you mentioned earlier that Rey doesn’t use the dark side as much as Anakin, and this just isn’t true. Especially with Starlight, her whole journey in that movie is her tapping more and more into the dark side until going full Sith-eyes on Kylo. Meanwhile, Anakin in TPM is super innocent. In TLJ, she goes “straight to the dark” in search of answers multiple times. Her fight with the Praetorian guards is extremely aggressive. She also summons Force lightning without any training whatsoever in this movie. The only way that last part is even remotely possible if she is literally supercharged with the dark side of the Force.