Yep, China seems to be tough to get into (and very expensive)... Burma is even tougher.
Just lately some seem to have managed to get their bikes into Vietnam, but the process looks a bit similar to China, with preparations long before crossing the border, and the guide and considerable costs.
But maybe if you´ll go to live there, that could make a difference. I´d do more research on that option, as I know there are some expats there who have big bikes.
Selling a bike bought in the UK in Asia, for one thing you might not be able to get a price that´d suit you. And then there are several carnet countries in the region - they have the carnet system to prevent you from selling a vehicle you bought elsewhere, so doing it legally you´d have to pay considerable import taxes.
Sending the bike back to Europe is also an option, and by ship it might not cost a fortune, just takes a little bit of time... but if you ship from India, be prepared for some hassle!