One of the great features of the first one....Star Wars 77 and not TPM....was that things were just presented and you accepted them or you didn't. Most of us imaginatively went along for the ride and accepted it.
Chewie was not subtitled. Jawas were not subtitled. R2 was not subtitled. Greedo was.... Perhaps a solution is to redub JarJar and not subtitle him at all if it can be gotten away with. Otherwise dub him in an unintelligible language and subtitle it.