In that video he mentions adding extra holes to the high reed chambers to help them speak easier and that this is done in modern instruments.
I know that is a pretty old Club instrument (1930's) and perhaps that helps with the old reeds. But the Club system is pretty much dead, so I don't think there are new instruments. The range for such a C/F Club goes up to A6: http://www.delaguerre.com/delaguerre/pedagogy/club/images/row_fingering.png. That's at least an octave from the piccolo range of large PA/CBA's.
Has anybody heard of such holes being added to the reedblocks (whether new or later)?