If I were faced with the problem, what I’d try is this:
Make it yourself with a Graves Preformer and a custom preforming cam.
Custom cams can easily be machined for must shapes of desired cuts.
All you need is a tame machinist to do it for you. Myself, I’m not a
professionally trained machinist, but at least I’m tame and might be
interested in making a cam just for the challenge of it.
Andrew jonathan Fine