I may have missed it but I didn't see anything that said that you would be completely opposed to a color film, have you considered color?
Provia100f has a 2 minute reciprocity failure rate, since you're going to India there will be lots of color in many of the textiles and buildings that you might see and it could be interesting to also get some color work done. Although personally I think transparencies are the way to go because of the color saturation and how beautiful they look on a late table, if you prefer to use color negative film for its more generous exposure latitude, you may want to consider Portra400 or Ektar100 as possibilities.
As for B&W, I think HP5+ is perfect for pinhole work, Acros100 also has a 2 minute reciprocity failure starting point, but because it's pinhole you may want more latitude which HP5+ may provide you.