Last minute! Mountain passes

[Trin Tragula]

Oh I forgot mentioning that you can freely invade Tibet from India from a wide open gap through Nepal/Bhutan with minor attrition of troops, as if the Himalayas does not exist at all!

India was invaded that way and vice versa in this era though.

 

[Trin Tragula]

?? I remember some TIbeto-Bengal empire but in the early modern era I don´t think they were invaded from Tibet by anyone.

For instance:
Bhutan should clearly not be cut off from India but was invaded by both Tibet and later Qing. The Gurkhas also invaded Tibet from Nepal.
See map D here for Chinese/Tibetan army movements in Nepal as well as Nepalese offensives into Tibet:
http://dsal.uchicago.edu/reference/schwartzberg/fullscreen.html?object=092

Had not Great Britain expanded in India Qing influence in at least Nepal and the various Himalayan states would be far from incredible.