I discovered a new option in the Ziegler - normally, white plays g4 and 0-0 in the Ziegler. However, this turns out to be quite bad as black quickly gets the better play.
A new idea is to refrain from castling - it seems this idea gives white a veru playable game in the Ziegler. Consider the below after 5...c6 6.Bc4 Bf5 7.Ne5 e6 8.g4
Blacks normal reply is 8...Bg6 ( 8...Nfd7 is much better, but impossible to find behind the board ) followed by yet another aggresive pawn move 9.h4. Black must play 9...Bb4 to open up the e4 square for his bishop. White only now throws in 10.0-0, with the below position
This complicated position is probably equal, but yields major complications after 10...Bxc2 11.Nxf7
Seems like a great alternative in the O'Kelly :-)
