A few years ago I made a double-sided jig for holding sticks for carving and for shaving, tapering or de-barking them. It is made of some scrap 2x4 lumber and one pipe clamp. One side has two vee blocks to support the stick and another block with a vee grove in it mounted on the fixed jaw of a pipe clamp. The adjustable jaw of the clamp is mounted on the opposite side of the 2x4 jig frame. The two vee blocks are made of short sections of 2x4 with a vee sawn in one end and the other end is screwed to the frame 2x4. Both vise jaws have 2 holes drilled through, near the end of the jaw, for the screws that hold the 2x4 to the jaw. The frame piece has two places I can mount the movable jaw of the clamp, one on each side of the frame. Both places are at the same distance from the end of the frame.
I hold the frame 2x4 clamped in a bench-mounted swivel vise. That way I can swing (swivel) the vise so that the stick and jig are not above the bench and can slant downward, toward the floor, for easy carving access. It can even hold the stick in a nearly vertical position.
I padded the groove in the fixed-jaw clamp 2x4 block with a piece of old bicycle inner tube stapled on, but I'm not sure that is is very important. The jaws could be padded with old carpet instead. Since the jaws are pine, they may be soft enough already and not even need padding.'
I have pictures taken from several angles for each of the two configurations of the clamping jig. They should provide enough detail to duplicate the system. I no longer have the jig - I had to leave it behind when I moved. By measurements I took on the picture, I believe the 2x4 frame piece is about 20 inches long.