If you already have an FAA ATP, and want to transfer over a rating from EASA, then it is a lot more hassle.
The easiest way is to transfer ratings as a foreign licence, but you are not allowed to hold anything more than an FAA PPL when starting the process. It simply is a bit of ground school and 1 or 2 sims for an LST.
If you already have an ATP, then a shortened type course is the best you will get (if the TRTO will allow it). They are entitled to make you do a full course if they so feel.