Hmm... very interesting. Did you consider the Bishop/Queen equivalents?
Or even (gasp) the Nightrider equivalent (moves as a 2/4 rider or captures
as a 1/2 rider)? The latter seems like an especially odd piece,
preferably for use on really big boards. And how would a king like this
work? Move as an Alf./Dab. and capture like a king, or capture like an
Alf/Dab/King? And would a CV in which every piece is like this work well?