I'm new in this forum, but to start off I would like to share with everyone that there are such services of Electrical reworks for end users.
As you know in HDB we have all the surface mounting boxes which looks ugly and all the tiny switches which looks so "giam siap" so i decided to change them to Legrand designer switches.
At first, I was thinking of getting a contractor to do it. But I do not really wanna approach contractor firms as it might be too costly and for such small job like mine they might not be interested to do or if not they just wont really do what I have in mind. So I got a friend of mine who is sort of doing freelance as electrical engineer that does electrical reworks for small jobs like mine.
I'm pretty satisfied with what they've done and it's not very expensive. If you are looking to do something like this or you need some consultation I can recommend this friend of mine.