I think you'll have to make one. I sold mine with the baby lens board a couple of years ago before getting the Comur with no T or cable release with a Trinar lens which probably came off a Franka camera.
www.mpex.com may have such parts around somewhere. I'd e-mail them. You could also try a shutter repair technician who is likely to have a good stock of older parts or who can fabricate things like Frank Marshman of CameraWiz in Harrisonburg, Virginia (search, and I've posted his contact info around here a few times).
Linhof made linkages like this, but they require a cable release adapter and are no longer made. I suspect they have the parts for them in some of their authorized service shops, but I believe they've generally replaced the QR system with a recommendation to use the short flexible Gepe extension cables, if you need them, which won't solve your problem, and if you can find a Linhof shop that will set you up with one of the original linkages with the cable release QR system, I wouldn't be surprised if it costs more than you likely paid for the lens.
What about tying a short length of fishing line or something similar to the lever and just pulling it to trigger the shutter without getting your fingers in the picture?
There is no end to the innovation on Apug, fishing lines and earth connectors! I will have a go at both after I get the lens adapted to the 0 board. Thanks all!
Shane, that Franken-Polaroid looks great, how well does it work?