is my real life/World knowledge combined with a question bank, good enough to get through the EASA ATP exams.
I'm afraid, but the answer is NO! Common sense and real world experience is not going to get you through the exams. I did the conversion myself, also hold an FAA instructor license, the EASA ATP question database (QDB) is not based on understanding and knowledge! It is more about stupid repetition and hammering the QDB over and over again! Thus, very time consuming and frustrating at times! I didn't have much of a social life, nor time for anything else during my ATP studies, particularly during the preparation and revision before I took the exams (started in March and passed the last one in October).