My friend who has been collecting audio provided me with more detail.
A lot of the audio we have is from YT rips or whatever low quality encodes, though the first English dub, Italian, Japanese, Polish and Dutch at the very least we have decent rips of, the first from VHS and the rest from DVD.
As far as we know there's only 1 Portuguese dub, done in Brazil, which makes the out of print and apparently next to impossible to find R2PT DVD intriguing; it claims to be 1.85 anamorphic with Portuguese and Japanese audio. All our sources are 4:3 and seem to be open matte.
The English dub credits misspell "Baer" as "Bear" (logical; the Japanese credits have the name transcribed phonetically in katakana).
The opening and closing themes are performed by Godiego (pronounced "Godaigo" - don't ask) - they're apparently somewhat known in the UK for "Monkey Magic", the theme song to a live-action adaptation of "Journey in the West" that got an English dub there.
ETA: I was wrong about the time period of the second dub. 1992 is impossible, since one of the VAs had been dead for years by then. First post has been edited accordingly.