Check out the combined pyramid-Ishi bow in TBB 4 p125. Basically a Modoc bow I guess.
Don't know why it has such a short draw length for a 59 1/4" ntn bendy bow though.. 23" seriously? i'd think it'd be easily possible to get 23" out of a *stiff* handle 54"
Also, Ishi's bows were (slightly?) bendy with narrowed handles. As were many of those paddle bows.