I haven't played Sekiro yet, but it's built from the bones of the Souls games and shares a lot of the controls just like Eldin Ring. I'd say the only major difference is you don't have as heavy of an emphasis on parry/counter timing (although it's still there) and stealth isn't built into the games (although you can slowly walk up behind enemies).

To me, I think that style of combat is "grounded" enough to fit well into The Witcher. Geralt is faster and stronger than normal humans, but not extremely so and some noteworthy humans have given him a run for his money or whooped his ass outright. I think Soils Style combat could do a good job of representing that.