Sure, you can use your JP account just with an Asian version of the game, though the same can't be said about DLC. PS3 DLC use stricter rules than PSP ones.
If you intend to get DLC it's best buying it from the store with the same region as your game;
Let's say you're currently using a JP account as your main, all your friends and trophies are there.
You can buy and play the Asian version just fine but JP region DLC most probably won't work correctly on your game.
In order to use DLC, unless Bumco adds some revolutionary new security system, you should make a secondary user on your PS3 and register for an Asian region PSN account. When you want to purchase DLC you should use this account.
Like mentioned before. any account can use any DLC associated with any account on the system, so because you have an Asian account with valid Asian DLC you can use and play the game with DLC on your JP account.
TLDR; It doesn't matter which region your console, game or account is from as long as the game and DLC region are the same everything should be ok.