Wingbar
Beamer is right. Unfortunately 600hrs isn't going to get anyone very excited in the airline recruitment world.
Whilst eghi r20 is correct that years ago the FI route was a well trodden path to the airlines it should be rememembered that years ago you had to have 700 hrs before you could take the commercial flight test (unless you went to Oxford or Perth for an approved course) and by the time most self improver QFIs had passed the cpl writtens/flight test/IR they were looking for commercial jobs with about 1500 hrs, and even then most didn't get straight into even a tp airliner but flew air taxis etc for a while.
Whilst at the moment there are some who are able to get airline jobs with low hours many cannot. However much you hate IT it pays well, the best advice, however much you don't want to hear it, is to go back to earning decent money full time and find a decent flying club where you can instruct at weekends to keep current whilst you keep job hunting.
Whatever you do, good luck.