"Danger, danger Will Robinson".
I hope this all works out for you but be very, very careful.
All very well for the airline to say we will give you a job once you have forked out a shed load of money from your own pocket. A day is a long time in aviation. Have they given you a contract? Even then you should talk it over with a local lawyer. Would not like to see you out of pocket with no job.
I'm sure others can comment on good places to get your rating.
Good luck.