I’ve been looking into this sort of thing for metalwork:
Wood should be easier — it’s unfortunate that V endmills aren’t available in arbitrary angles which would make it a simple matter of calculating the exterior circumference of the bend, the interior, then determining the chords which would need to be regularly removed to make the two distances meet when bent.
If one is willing to accept voids (fill with glue?) then of course one could just use a series of pockets.