If you assume that all of your hours are valid, but none of your qualifications, then that's a fair starting point.
I'd suggest that stage 1 is to pass the JAA PPL(A) exams and skills test, you'll probably need 10 hours to bed into a new type, prep for the skills test and pass it, do the dual X-country and the qualifying X-country.
After that, you'll pretty much be in the same position as anybody else, who has just passed a PPL so another 150 hours or so during which time you need to do your (14?) CPL/ATPL exams, then do the 25 hours CPL course.
G