FWIW, pictures and details of the setup on my 32-III here:
http://www.ericsonyachts.org/infoex...-quot-Bail-quot-and-ATN-TAcker&highlight=bail
I bought a Schaefer forged-steel bail, squeezed it a little to fit the anchor-roller flanges, and hold it in place with the existing FastPin. When using the assymmetrical kite, I have the tack-line running through a block clipped to that bail. When using the anchor, I pull the pin and the bail comes off.
NOTE: my assymmetrical is a light-air runner, which means there's never going to be much load on the tack-line, and most of that load will be "up" (which is the direction that whole bow-plate/headstay fitting is designed to handle). I would *not* use this setup if I were racing, or reaching in any sort of breeze.... In other words, it works for what I wanted to do, but may or may not work in a "general" sense.
Just my two cents...
Bruce
Edited to add: IIRC, I used a Schaefer 90-27 bail (cost about 50 bucks online). Nominal width is 2-1/4", I squeezed it in a vise to get it to 1-3/4" wide so that the ends would fit inside the sides of my anchor roller. it comes with holes for 1/4" fasteners, I drilled them out to fit the existing pin on the anchor roller. *IF* you have the same anchor-roller, that should work (but you may want to measure before ordering).