I have tried to explain the challanges to getting the list you want, but things seem to be getting lost in translation. I will start with an English saying: "It's like finding a needle in a haystack." In this case, SHS has tools to sort and pull a batch of needles (e.g. Spanish works first released in 1975) but we can't just pull those needles that also have some additional feature.
But that will have to be found on Discogs, right?
I doubt Discogs has a search feature that will just pull what you want either.
This is where you have to upload them if they are found.
No one "has to" add info from Discogs to SHS, but a lot is. This site is essentially a compilation of information found on other sites, including Discogs, iTunes, Spotify, 45Cat, etc.
But here are not even close to all the versions, you have to go to Discogs to find them.
I can assure you that there are many recordings/performances that meet your criteria on Discogs but not on SHS, and vice versa. I can also safely say that searching for what you want will be easier here (even if inefficient) than on Discogs.
Are you sure you are not a Spaniard disguised as a foreigner?
Positively not a Spaniard. Just a simple guy from North Carolina that speaks not a word of Spanish (though my sister speaks it and several other Romance Languages).
It seems strange to me that a foreigner has no interest in wanting to look at any country, every time it begins to seem more to me that you are a Spaniard who denies what is yours, like an ignorant one of those who voted for the government that is here or like those who live in the region of Catalonia, which are even believed to be from another nation.
I'm going to tell you a phrase in Spanish to see if you understand it and check if you are an anti-Spanish Spanish or if you are actually from abroad.
Vete a la mierda ,gilipollas.
I see no reason to insult the only active SHS contributor who (as of now) attempted to help you. I can also use Google Translator as anyone else can. The lack of an SHS search function that will yield a list of performances you want does not equate to apathy. The likely thousands of adaptions on site in languages different from the original song/work evidences the interest that the editors have in such recordings.
Searching "Spanish" in my personal notes returns over 1K recordings (which doesn't include assumed Spanish that are currently flagged as "Foreign"), and I am currently reviewing a number of confirmed/assumed Spanish versions of "Can't Take My Eyes Off You". This all also evidences my personal interest in non-English recordings of songs that are also popular in English. I admittedly have no personal interest in Spanish originals that are unknown to me in some English translation.
Upon that search of my personal notes, the first recording listed is a Spanish version of 1, 2, 3 Red Light by the Las Ventanas and released in 1969. I have no intention of creating and posting a list of all such recordings in my notes.