OS Multilanguage + CJK add-in?

Hi guys, so far I only found 1 EastAsia 9800 OS by Rogers.
9800jAsia_PBr6.0.0_rel695_PL6.4.0.105_A6.0.0.246_R ogers_Wireless_Inc.exe
I'm not really satisfied by its performance, especially there's a huge signal strength difference with my previous 9700.

Is it possible for us to use a latest Multilanguage version (9800M PBr6.0.0_rel862 PL6.4.0.120 A6.0.0.284_Bouygues) and add in CJK read and write font support manually, as mentioned by our mate here?
Is there any impact or side-effect by doing that?

You can always download the newly leaked jAsia .337 from here. I've found it to be an optimized version of the Rogers release (as that's the one I was on from the beginning since purchasing the Torch).