Eeyor, you will find very limited options I am afraid, and plenty who say they do actually don't. Your best bet is to check out girls who meet your looks and service requirements and then discuss your roleplay ideas. I have found it useful to buy a small number of uniforms that match my preferred physical type. You will find native English speaking girls (Hazel Kitty) easier to discuss with although Maggie21 is certainly up for it. Alot comes down to chemistry; I have a regular who hardly speaks English but finds role play fun - you just have to get lucky.
Let me know if you find success.