Don't pay for a type rating unless you have a rock solid job contract in place.
'You don't have 500hr on type' is the inoffensive way of saying we don't have a job for you. If you the speculate 50 grand on a rating independently, when you go back to them the answer will likely still be no, but now you're 50k lighter and locked into one aircraft type. If they were serious they would interview you now and offer you a contract subject to completion of a rating and hours. But they won' do that, will they. There's your answer.
PS There have been approximately 100,000 threads on this very subject.