Might NGC be willing and able to create a "pattern-friendly" set that would, for example, allow me to showcase the finest-known 1875 Commercial Dollar in Silver (1875 United States T$1 J-1423), as pictured here?
We could include such limited pieces (potentially combining them with select non-pattern specimens to, for instance, produce a comprehensive collection of all silver dollars, including all patterns and special strikes) creatively by speculated purpose, anesthetics, denomination, epoch, etc.
Such a set may introduce more challenges to the expert numismatic who has already aced basically every set!