Hi
I think your plan is eminently sensible, although in your shoes I think I'd do a modular course rather than lose out on the income to be earned in the meantime, not to mention forking out for accommodation. You've drastically reduced the risk by having a back up career option, and there's nothing in it between modular and integrated.
I think you will be considered very employable by an airline with accountancy as a string to your bow. There is nothing airlines love more than money. They're not even that keen on flying or pilots.
Best of luck!