This is my favourite travelogue topic, I keep reading new stories about this transcontinental journey on
Horizons Unlimited - THE Motorcycle Travel site. The forum is lively and has exploits of people who have done West Europe to the Indian subcontinent.
However cheaper option is shipping your container (containing the car/s) to Izmir/Istanbul and then continuing the journey from there. Cheaper than flying the car down there which would cost you almost 10x the shipping costs.
We are talking lakhs (Rs. 300 per kg air freight++) as compared to couple of tens of thousands in a ship (20 tonnes).
Well if you go through a shipping company (will love to do this for you) you can also travel on the ship as a passenger accompanying your vehicles.
I would love to join HVK, Ramkya, dates and times please.
China route from India/other countries. Other travellers travelling through China have found it very very difficult, why ? The Chinese government insists that an escort accompany you and the costs (per day costs) applicable to the escort ( a military person) be borne by the traveller. This makes it a very expensive proposition, many westerners would have loved to continue their journey starting from London to Shanghai or upto Vladivostok. (Coast to Coast of both Europe and Eurasia), however China with its weird & completely discouraging overland travel policy makes it near suicide to spend the kind of money needed to travel China overland.
Better done via Russia (trans siberian route).
Cheers
M