Nice writeup!
The border we were able to get through from Uzbekistan to Tajikistan was Buston.
It is possible to get your Indian visa (and thankfully they lifted that 2 months between rentry rule  usually the Pakistan visa must be applied for from your home country. But you are going out to Laos so you'll have easy places to roam if you need to mail your passport.
We also did a shorter china group organized on the HUBB and it was a great experience apart from the tour operator. That part might be a little slow and frustrating but the scenery will be amazing!
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