Hey there! I read your thread and I'm friends with quite a few courtesan roleplayers, I also like to think that I know the ins and outs of RPC to an extent. I could be wrong, but I don't think you're going to have a whole lot of luck finding clients over RPC. Everything else you listed though, this site is perfect for.
What I suggest is making your character a tumblr, if your character doesn't already have one. Get a decent following by following as many character blogs from Balmung as you possibly can, especially fellow courtesans. I think tumblr is where you're going to get the most luck in terms of finding clients.
Another suggestion might be a website like Darknest. Either way, good luck!
Update: It looks like you have a tumblr already. My bad.
What I suggest is making your character a tumblr, if your character doesn't already have one. Get a decent following by following as many character blogs from Balmung as you possibly can, especially fellow courtesans. I think tumblr is where you're going to get the most luck in terms of finding clients.
Another suggestion might be a website like Darknest. Either way, good luck!
Update: It looks like you have a tumblr already. My bad.