Yeah jumpering may be your only option if you want to play it any time soon. You could search for hours through a giant pile of hen's teeth and not find a single namco kick harness, it took me 6 months or so to trip across any after I picked up my Soul Edge board. Apparently once the factory that was making them shut down, nobody bothered to start making them again as there just wasn't enough demand, so what's out there is out there and most folks hang on to theirs.
Jumper it hopefully in a reversable fashion and keep a sharp eye for one of the kick harnesses to come up somewhere. I finally managed to snag a pair from dj_dns, one for the soul edge and one for another board which is even harder to find than the kick harnesses. He has enough parts go in and out of his place you may want to PM him to see if he can trip across another one.
Enjoy the Ehrgeiz, I remember the game being fun as hell and it'd be cool to get my hands on the board one of these days, though that's way down the priority list for me at the moment.