I also founded out an english dub of the first episode of doraemon 1979 exists
From The Lost Media Wiki
The title of this dub was "The Gadget Cat & The Five Foes" The dub was released in American theaters in 1982 as a theatrical short The short was extended to 8 minutes by taking footage from episode 2 mainly the beginning of that episode Despite this, The dub was only screened a handful of times being last screened on April 19th, 1987 in new zealand according to an advertisement from an newspaper from that day