However, there is the issue of the drop out/ RD hanger - I'm not sure if we could just cut it up and/or weld an appropriate vertical dropout.
Considering all this, I have no doubt that including a 3 speed front is a much easier task and would involve sourcing the following
1. New 3/5 speed chain - Rs.200 approx cost (Hero)
2. Btwin triple MTB crank - Rs.1500-1600 give or take
3. Shimano tourney FD - Rs. 300-500 give or take
4. 3 speed front shifter - Rs. 500-1000
5. Cables and housing for the FD
Tools required would be the following
1. Crank puller
2. Cable and housing cutter (Or bolt cutter, if you are like me)
3. 14mm socket wrench (bit) and/or bit rod (to take out the existing crank bolt)
4. Allen keys 8mm, 6mm, 5mm, 4mm and 3mm
Still, even considering you would have all the tools, at 2.5k INR, I don't think its a worthwhile upgrade.
Regards,
Shankar