It will be difficult to get "current info or "unbiased" opinions". By virtue of it being an opinion it is going to be biased...
We did exactly this trip from Nepal to Turkey via Pakistan and Iran 2up on our bike. We had not problems, all you need is patience and you'll be fine. If you want more info or want to get in touch with my better half to have a female perspective just send me a PM.
To be honest like most people who travel this route, Pakistan and Iran were the highlights of the trip. I consider myself very lucky to have been and it's an amazing part of our world, I'm sure you'll enjoy the trip, especially once out of India ;-)
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