I think TS might be asking for a lab that converts digital files into 5x4 tranny, imagine artificial/fake tranny film. I remember such a service provided by a highly professional printing lab in Australia but not sure about Singapore. It would be a highly irregular and specialised service, sg labs might not provide it.
If memory serves RGB used to have a service of digital file output to a filmwriter so in theory you might be able to get a trans, however their unit was the older model then and could not produce the high end kind of output.
I think you need to get the phone book and make calls. This was never a big service area 8 years back and I think your best bet may still be the specialist labs in USA.