Good question...No other shop tools are coming to mind right now that would do that easily.
You could cut it with the handibot in two cuts on a larger piece of wood. Either you’d model it and toolpath in vcarve...
Or...there’s a real simple bit of ShopBot code you could run to cut it:
SO,1,1. (Turns On spindle)
Pause 2 (waits for spindle to get up to speed)
START: (Initiates a “loop” in the code)
J3,6,0,0.25 (moves into position at front left of handibot)
MZ, 0 (moves down onto material)
M3,0,0,-0.25 (cuts a 6” long line with a -1/4” slope)
MZ,0.1 (moves clear of material)
MY, 0.01 (indexes the tool slightly in Y for next pass)
ZY (zeroes y axis—this will allow us to loop through the code)
GOTO START (restarts loop)
This will continuously cut a 6x0.25 slope in a piece of wood, indexing by 0.01” after each pass. It might take a while, but just let it run until you’ve got enough of a wedge to be useful.
I’m sure there’s a more proper woodworker-y way to do this but this is what came to mind this morning!