I have just checked the Commenwealth graves commision web site, the names of the crew appear on the Singapore Memorial, so there is at least some record of the accident and so for the past 60 years somewhere for the families to visit.
As for whether or not the remains should be returned to the UK, it was policy to bury the dead in the country where they fell so how about the remains are taken to the Commenwealth cemetry in KL or Singapore and each crew member given their own headstone.
Just a thought..... the main thing is that they are remembered and never forgotten.
ICSC