did you mean Emergency Procedures Instructor trainee? this is an entry level position and the main responsibility is to provide emergency training to crew members (both cockpit and cabin). this isnt anyting related to flying emergency but general emergency procedure such as evacuation etc. you are required to get the necessary licenses within a few years (they will train you).
there were people successfully "transformed" to the cockpit in the past via CPP from this position, with and without any hours. "transform" because there is no such thing call "internal transfer" but internal vacancies for staff to apply and the process is very much the same as the applicant via the normal channel. There is never any internal application so far (as i remember) for cockpit position except the scholarship program (2 vacanices per year up to age 30 or near with 2 years of continuously service at CX in any position may apply, not sure if it still exists. in brief, this is internel CPP).
im not sure if they still interested in ppl at your age but no harm trying. if you get interview offer, better prepare question like "why interested in this position" etc. No or little FL tech question will be asked as the initial interviewer is from personnel.
If you have the rating (CPL) and a few hundred hours, try to seek for flying opportunity in the private sector, or their FL ops position. they take ppl with this level of experience.
if you are local, HKA has a so called "cadet" position for people with rating but little hours. they dont advertise anywhere but you may drop them an email. their "cadet" is actually a RHS position with little pay and prepare a timeless waiting & training before really flying line.
no CPP taken at your age so far but it doesnt mean a "must-no" because it really goes case by case. DE is definately a big "no' if without the minimum hours.