Kino Lorber have revealed that they are preparing a Blu-ray release of Henry Hathaway's Nevada Smith (1966), starring Steve McQueen, Karl Malden, Brian Keith, Arthur Kennedy, and Suzanne Pleshette. The release is expected to arrive on the market later this year.
It's extremely rare for any Kino release to have an isolated score. But I guess that it exists, given the La-La Land release of 2019.
The only time I recall Kino including an isolated score was their Prince of Foxes Blu-ray, and I think that was leftover from the Tyrone Power DVD box set and done before the Kritzerland remaster.
Edit: Just remembered they also included the isolated score with Nick Redman commentary on their Blu-Ray of Mary Queen of Scots.
It's really only Twilight Time that went the extra mile with including isolated scores. It's probably a lot of work (if even possible) for very few extra sales.