R:If the judgement is in heaven, will flesh/unclean enter?
nope, not according the scriptures
R:If the judgement is in heaven that has come from above (to earth) in the form of the new jerusalem, will flesh/unclean enter?
nope, not according to the scriptures
R:Is there any scripture to prove that the great white throne judgement will not be held in heaven?
not that I know of, but I don't know of any that do prove it's in heaven either, so that's why I think talking about where the White Throne Judgement will be held doesn't help the debate on either side and the discussion can continue without that information.