

Slightly off topic, but might be useful to you: If you look for BluRay remuxes you can also often find things with multiple audio tracks. Then you can just strip everything unwanted out of the container, which would leave you with the original video and a Spanish dub. Also, since you are looking for specifically Latino Spanish, I would hope this is also released on BluRay releases, or do we have systemic racism to thank for that not being one of the many common audio dubs…
Correct me if I am wrong, but did this not happen to the music of a bunch of Soviet era composers, that was temporarily free of copyright in the USA and then later had to be put into copyright again after the Cold War ended?