If the original 1977 human Jabba was included in the film, I think he’d be the only human in the OT to speak with an accent that is not either American or British. (He had an Irish accent).
It’s interesting that the OT featured little variation in English-speaking human accents, but a lot of actual alien languages. Beginning with the Prequels and continuing throughout modern Disney Star Wars, we see a much wider variation in human accents (New Zealand, Scottish, etc.), but much less actual alien languages with sub-titles.