I have good news. It looks as if I have now located a copy of the movie Cri-Cri el Grillito Cantor (see my very first post on this blog). I should receive a copy of it within the next few weeks and will post the Three Little Pigs special cartoon it contains on YouTube after I do.
Please note that I will be doing all this purely for historical reasons.
Are Myklebust also noted that unlike previously mentioned the movie was not directed by Carlos Amador but by Tito Davison.