Your portraits from India are wonderful! Great job!
The focus lever that attaches to the lens like a ring makes focusing quite a bit easier when using the broom-stick handle. Especially if most of your photos are being taken at a similar working distance.
I would also second johnsey's suggestion of looking at the P645 if the 67 begins to feel heavy. If you do, I recommend the 645N. It is a lot cheaper than the Nii but includes almost all the same improvements over the 645 Original.