That sounds eminently logical to me! The point of the modular course is to offer a route to the ATPL for those who can't raise the cash or the time for an integrated course, not to save money. If you go the modular route in an integrated timescale, away from home, it's the same product - so it will cost the same!
In view of the preference of airlines for the integrated course graduate (at least at low hours), why would you want to do a modular course in the same timescale?