Yeah I reckon you could be right, if you know of any agencies over there who can set up meets with pornstars, please share, thanks.
Well, having had a good look for the last hour or so, all the agencies I would have pointed to have gone. One, which was easy to find, read like a "Who's who", and would have been perfect for you. Prague, in particular, seems to be a shadow of it's former self on the internet, although whether this is true on the ground is another matter entirely.
The only one I can point to now is:
External Link/Members Onlywhich doesn't come up on speculative searches, so you may have missed it. Unfortunately, they don't have any of the really big names.