As You only have to withstand the forces of sawing, and even some of the part You are sawing on will be supported in the vise I suggest You line the drops up on a flat table with one edge lined up against a streightedge and tape with filiment packing tape. Turn over and do the other side. I have actually seen this done with material that was milled to shape in longer bars and cut into sections about 1/2" thick. It worked better than I thought it would, the bars were about 2"x2". If the saw vise stops far from the blade use 2 strips of stock 1 placed each side of the work to extend the vise's clamping close to the blade.