Degrade VS 2012 SSRS report to VS 2008

I have been asked to degrade an SSRS report written in VS 2012 to VS 2008 because of incompatibility issues with SharePoint.  Has anyone done this?  Is it even possible?  I have not been able to find anything about it, so I'm wondering if it is a lost cause and the reports have to be rewritten.
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Nakul VachhrajaniTechnical Architect, Capgemini IndiaCommented:
To the best of my knowledge, downgrades of SSRS reports are not supported due to the differences in the XML schema of the RDL files.

However, you may try using one of the following:

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