You are right, Bokomoko, I checked in my old -228 manuals.
My original point was that it is acceptable to call directly Flaps5 after the clean config. if one wishes so, and Flaps 30 after 15, that there are no technical reasons that prohibit so.
Since this is one of the areas not covered by the SOP of certain small companies (and even bigger ones), if my boss shouts at me that
I have to transition through Flaps1 and also Flaps 25, it seems I can tell him his absolute truth is only true to him, and around the world experienced professionals do it in other ways...