You'll loose some flow by using reducers, but it's better than loosing pressure to small tubing.
I don't know the availability of such parts in Hong Kong. If you were in the USA, I'd point you to a local hardware store, but they usually carry fittings in 1/4" increments, not 1/8. Otherwise, I'd point you towards
www.mcmaster.com .
If looks are more important than functionality, then I can't help you!