I believe you’re overthinking this a tad, but we all do when trying to work out sizing for expensive denim.
You have posted very specific measurements for a pair of Levi’s, above. If these fit exactly how you want them, then choose a jean with measurements similar to that, and “voila!”. If you’re getting the flagship 21oz denim (666s-21 or 461s), you will get an inch or a little more stretch in the waist. They will also stretch a little bit in the thigh and knee.
As for the cut, branch out a little and scope 634, and 463 before you pull the trigger. Don’t forget to look at the rise measurements, too. The denim weight will influence the way it feels a little bit, but with 21oz you’re still getting a pretty soft and wearable denim.
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