I don't believe for one minute that people typing 'Adultwork' into a search engine are looking for anything other than Adultwork. I get lots of hits from Google and the search terms are things like 'Scarborough escort', 'escort Scarborough' and so on - it seems a little odd to specifically market a site purely in order to try and pick some traffic flotsam from people who were actually looking for another site. Why not try and make a standalone one that will attract users because it's actually good?
'Available Today' and on-site 'booking systems' are not the industry standard, they are what is used on Adultwork and despite what you might think, the two things are not the same. Do you honestly think we are so thick that we would be 'confused' by you using different names for your features? How exactly will this help you not look like an Adultwork clone? No other successful directory I know of uses these 'features', and I get a lot more work from them.
You obviously have a fixation with the site, but AW is just one advertising directory out of countless others, and whilst it is a busy one their main advantage comes from the amount of traffic they get, not because the site is a particularly good one. I get little from it, and even most of the people using Adultwork don't use the booking form, they use the site as a location tool and just ring and book, and I'm fairly sure that even the Adultwork fans on here would agree. Why overcomplicate things? All we need is somewhere we can describe ourselves, our rates and our services and provide a phone number if we want to, and a link to our own websites if we have one.
I'm also interested by your proposed pricing structure - if the site is busy it will stay free; so if it isn't (and therefore nobody is looking at it) the advertisers are going to have to pay to cover the cost of you making a site people aren't using? You can spout whatever SEO twaddle you want. We do this for a living, and like you've said, we've seen it all before more times than I care to remember. Have a read of
this thread if you fancy a real laugh.