On the contrary, adding the T in Tjin only makes it the more difficult to pronounce. Angmoh read it as ter-jin. Saying it would make everyone sound like a stutterer. This is why its Qui-Gon Jinn. Not Qui-Gon Tjinn. I am sure Liam would have protested if it were so.
As for Hsien Loong, now why you go and bring up this awful name for? Now I feel sad all over again........what a downer.......:p