PTT instructors need to be trained by attending a course, putting additional load on instructors and limiting their availability as the pool of PTT instructors is smaller than the pool of instructors in general. This is overkill and a thinly-veiled attempt to make people think the sim is a particularly valuable part of the training system and not an attempt to compensate for a lack of flying.
By all means have a laid-down syllabus and process, but have it on crib sheets and allow any appropriately-knowledgable instructor deliver that. It isn’t like they are CAA-loggable hours and it will be so long between a PTT sortie and a flight that most of the skills taught there will fade to a vague memory.
result being, you can still achieve whatever it is you expect to achieve on a PTT, more easily, especially when used on more, simpler, closer sim rigs.