I think it's a great idea Mellors. Good to see that you're being proactive! It would certainly make the city a more viable option to ladies who tour if they knew that they had a few genuine clients before they arrived. It's easier to deal with timewasters when you've already got a few guaranteed appointments as there's less available time for them to waste.
Guys in parts of the country that are known to be difficult to work in should take note of what you're trying to do.
The ladies also can combat timewasters by asking for references. One or two ladies do this already and it seems to work for them.