That top speed is about twice a fast as most London traffic goes! And whats wrong with 'basic' less to go wrong - the noise of India's town traffic you wont hear a radio - as long as the horn works it will be OK.
I suspect the £4000 European version will be somewhat sturdier. Not a lot of room for 18" alloys though. My old "Deux Cheval" which I drove in Spain in the 1970's had a similar sized engine and went quite a bit faster than 43mph.