Bangkok has a BMI office. Now, I don't know building names, but you go down Silom Road (heading west) until the corner of the cross street where the skytrain bends towards Chong Nonsi BTS (it could be Narathiwas Rd).

On the corner diagonally opposite TG's customer service office (still under renovation?) i.e. the side closer to the BTS station Sala Daeng, there is an office building.

In that building is a BMI office. I can remember reading on a post a while back that someone in Diamond Club was helpfully assisted by this office. ^