One thing that comes to mind beyond/independent of preparser tricks (which can be hard to make robust): sagecell already has a lot of "languages". Would it be possible to have sage-py2 and sage-py3 as languages? We could then start out having "sage" as an alias to sage-py2. At some point we can change over the default. At that point, people can "fix" problems by setting the language to sage-py2. Once we've had that for a while, we can remove sage-py2. At that point we should probably keep sage and sage-py3 as aliases because changing them would cause further breakage.
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