It came to my attention by FBIwinx19 thatthe EU Portuguese dub of Goldie: Abenteuer im Zauberwald (the Bambi knock-off, and known as A História de Bambi) was found. It was buried in the middle of other videos posted by foreign portuguese comics.
Here's the video:
The most interesting part is that when I contacted Dingo Pictures themselves, they didn't mention this dub (probably because it isn't documented on the Dingo Pictures Wiki).
So a Portugal dub of Goldie DOES exist after all! Hopefully that would lead to the rest of the missing dubs being found soon.