I did a similar route and added one month in Vietnam on top of it. I also had a hard time deciding whether to bring along 35mm or MF. Eventually I took an M6 with 35&50 summicrons, a light weight tripod, and used only Delta100 film. The Leica allowed me easy street shooting and the Delta + tripod allowed fine grained images of Angkor. I haven't regretted that decision at all.

In any case, enjoy the trip! Cheers...