You mention long and low to go on the railings.
So how about 2 of the flags but with the extended sides 1 like that one and the other reversed so that the extensions face towards each other.
The central green strip could then be inserted all the way across between the flags and Carry the words "We are FGR Ladies" centrally on the banner.
I have mocked up what I mean but can't remove the Black square round the badge, and obviously the font and size aren't necessarily correct.
