Make "Access Rules" Sidebar on Post / Page Types Searchable

When one is creating a new page or post type (e.g. product, course, etc) AR Member provides "Access Rules" via a blue sidebar on the right of the page / post type.

It would be nice if this blue sidebar was searchable, so that one could choose the plans with greater ease. For websites that have 50+ unique plans, the current configuration of having to scroll down the page can be a big time waster. (See attached image). It would be a lot easier, in terms of UX, if one could search for the associated plan, instead of having to scroll down from the dropdown list.