I would certainly use the VCarve fluting toolpath. As it uses vectors to locate the center of the bit, the cut will extend beyond the pattern by the bit radius on each side. I've found that spacing the vectors at 1/4 the bit diameter will give you a satisfactorily smooth surface. I've extended the vectors beyond the edge of the material so the flat that is cut at the end is in air.
This is cut with an end mill with a flat end There is no way to eliminate the radius in the corners since the cutter is round. A smaller cutter will, of course, result in a smaller radius.
Good judgement comes from experience.
Experience comes from bad judgement.