Any district also can get FL. Get the contact of a PRC FL in Geylang, treat her well, give her lots of tips and tell her next time, you prefer to book her at Farrer Park.
When you want her service before she balek kumpong, just tell her to meet you at your designated Changi/ Farrer Park/...
When she comes, pay her taxi fare, give her big tips and she will be very happy with you.