User blog comment:Moooosey/Simple psi-- a fairly simple ocf/@comment-43798125-20191026225036/@comment-35470197-20191026232456

It is impossible, because such a "collection" of ordinals is not a set any more.

Also, I am afraid that you are studying OCFs without studying ordinal notations. As I wrote before, ordinals do not literary yield a function with an explicit algorithm to compute it. In order to create a computable function, you need to create an ordinal notation which imitates the roles of the corresponding OCF. Otherwise, you will be in the maze, which many "expert" googologists here had trapped in, i.e. you will misunderstand the uncomputability of OCFs.