Here is what the tool looks like making chips, in this case, plowing the face off a dovetail cutter:
And a PDF of the plans (as seen under the tool above): champferTool
To cut the pocket I used the DRO’s angled line function (the faces I cut by eye), tedious but probably faster, overall, than dialing in two angled setups. If I was going to make more of these, I’d probably make a jig. I tried using a machinist vise but that was a bust.