What USMC said.
Also, whatever vacancies exist for new-hires are essentially guaranteed to be less-desirable aircraft or bases. Since everything is based on seniority, the company has to open any vacancies up to the pilot group as a whole before they offer them to new-hires. Anything remotely desirable will get taken by senior pilots...anything they don't want goes to new-hires.
If it's just size you like, in some cases you might be able to get a larger airplane, if more senior pilots stick with smaller equipment to avoid reserve.
Also you seem to have some misconception about airline "recruiters"...
Since the average decent airline has 100-10,000 qualified applicants for every job opening, the recruiters don't actually recruit in the traditional sense of the word. They could be more aptly called "weeders", since they mostly weed people out.
They have all the cards, and applicants have none whatsoever in most cases...trying to negotiate anything would earn your application a fast trip to the shredder.