Not dodgy if you leave enough time.For longhaul,you wouldnt be commuting up and down that much anyway so you would probably earn enough to cover it.
My initial training,it was hard going.But i never ever wanted to leave.If youre thinking about leaving,there is a reason why.Get yourself a job with a temping agency for now,there are plenty of other airline/airport jobs out there - people might even still be recruiting for the summer.