Haha–knew it wouldn’t be long before there was another. Good way to tilt a bottle of fingernail polish!
So, @nunzioc got it right, I used a jig that I cut on the Glowforge. Here it is:
And of course you are limited by how long your piece can be (about 2.6" or so, max), but you can make it pretty wide–8" or so… I’m waiting to get another part I need before I will know the exact dimensions, then I’ll cut it out of walnut.