Theoretically its possible to convert Skyrim 1.6.1170 into 1.5.97 using the resources of 1.6.1170 and the executables/Dlls of 1.5.97.
The reasoning behind this is that:
- Skyrim.esm didn't change since 2011. Maybe they changed the header to 1.71 but we can still replace it with one of the versions of Skyrim.esm of 1.5.x
- Update.esm, DLCs.esm are editable by
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, we can change the header using that tool.
- _ResourcePack.esl can be remunerated by FormID from 800 upward.
But the real question: is it worth to do that?