Hmmmm....
Thinking about what I have handy, perhaps a holding jig that has a 2" hole drilled into a series of 2x4 cutoffs, restacked high enough to support the Dowels (maybe 8"?). Could also drill larger for a sleeve of some 2" ID pipe (PVC) or just hole a top and bottom plate and form a box.

Maybe better would be the above box, cut in half through the holes. This would allow leaving the back half clamped to the DP table. You could then easily add/remove dowels with out the chuck getting in the way. Add dowel, replace other side of box to clamp it in place.


Of course it seems a lathe has the best potential for accurate hole location.