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travel to Islamabad and Dhaka

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Considering my past experience with russian aircraft's navigation accuracy, you might be much better off, dead center on the airway.
 
In regards to the offset, there is actually a new procedure in certain FIRs called, Strategic Lateral Offset Procedure ( SLOP ) that allows offsets of either 1 or 2 NM right of track for aircraft with automatic lateral tracking capability. Previously we offset 1 NM in any IATA Inflight Broadcast Airspace such as over Africa and the Yangon FIR, especially the northern routes that enter/exit from Chinese airspace.

The Inflight Broadcast offsets were for traffic reasons while the SLOP offset is for Wake Turbulence avoidance, but could just as easily be used to make you more comfortable with traffic avoidance. The NOTAM that talks about SLOP specifes which FIRs it is allowed to be used in.

Interestingly, I always use a 1NM offset while climbing or descending on the Airway between Kolkata and Dhaka. It used to specify doing that in our FOM, but doesn't anymore. It is a very good idea as Dhaka doesn't have Radar coverage until you are within 50 NM of the airport and the Kolkata controllers are not to be trusted. If the TAF for Dhaka includes something with a TEMPO for thundershowers with wind gusts up to 50 knots believe it. They get some nasty thunderstorms passing overhead which usually last around 30 minutes. I've been there on a turn-around when one came through. Luckily our station mnanager was on top of things and cleared all the equipment away from the airplane and closed the cargo doors before it arrived. We watched it rain sideways with gusts over 70 knots for about 20 minutes. The power in the airport went out during the storm. When it was over everything came back to normal and it was a nice night with no trouble on the departure.

Typhoonpilot
 

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