I've been playing with the idea of a vinyl cutter, and instead of a diamond drag knife, I got a "CBO9" blade holder and an assortment of carbide blades on Amazon. I made an adaptor to hold the cbo9 and attach it in place of my dust collector.
I used V-carve pro to design a simple stencil to test on a scrap piece, and it worked perfectly the first time. The cbo9 is adjustable for cutter "stick out", and I made mine so it floats against the surface of the vinyl so any variation in the surface (table, etc.) doesn't affect the cut. The cutter blades are 30,45, and 60 deg. angled. I used the 45 deg. without having to create a corner rotation move because the blade is so small diameter.