SMW has awesome products. Recently purchased their hobby mod-vises and they’ve been a game changer for me.
However I like their products, fixture plate is something I’d rather make myself. You can certainly get the mic6 plate at very reasonable price from Midwest Steel Supply. Any shapeoko will handle boring and tapping the holes. In another thread, I’ve uploaded a file with all my speeds and feeds for cutting threads in sizes from m4 to m10. It took me few hours to bore and cut over 400 m6 threaded holes, but it was well worth the time. My fixture plate works flawlessly with the SMW mod-vise and I know that the holes are perfectly aligned to the machine.
I strongly recommend you consider doing it yourself. It’s a great exercise in cutting threads and tbh machine does most of the heavy lifting anyways. Just my 2c.