Most of the girls working in the Hooters on Soi 4 when I visited weren't Thai. There were a mix of EEs, American and even some black girls. They were hot, looked cute, but the beer and food was overpriced. Some of the girls were absolute stunners, and even the not so stunning ones were still pretty damn nice.
It would be difficult to meet up with them as it wasn't that easy to even chat to them for a moment. It was busy, and they were all running about the place. I talked to a lovely looking redheaded Irish lass, but after a minute or so she was off pulling pints.
Perhaps at a slower time you could try, but I presume it would have to be done on the sly. Regulars might have a chance, but it's not really worth the expense. Probably best to ask them where they go on nights out and try to pull there.
A lot easier just to go to other bars and find a cute little spinner. Cost a hell of a lot less too, no doubt.