There is enough information on this site to suggest that riding an Indian registered bike through Pakistan is not possible anymore due to Pakistani regulations. Riding through China apparently is also not allowed by China unless you have a Chinese driving licence.
It seems it is still technically possible to ride a Nepalese registered bike back through Pakistan and Iran. There are warnings about safety around the Iranian/Pakistan border but many say they have travelled through that area recently without problems.
Good luck with your project but I think you need to do some more research and be prepared to adapt your plans.
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