Shorts, all my respect to you for sure. I know what it has been like hand stitching with two hands and I'm just starting out, I could not imagine doing so one handed. (seriously)
I can not afford a machine at this point and do not want to run out and purchase something that is going to either burn up or not do what is needed of it. So hand stitching it is for me. Someone in another post mentioned making a better single diamond punch. I have to find that post as I found something they could use to make one that would last just about forever I think. It is a Scribe that is hardened and looks like it could be reworked at the tip and re-hardened again. Look like one of the old time scratch awls with the door knob handle but it is all one solid piece of machine steel. painted blue, they have them at Lowe's if anyone is interested.
Also with hand stitching I found a flexible acrylic guide with holes punched in it at different stitched per inch at a 45* and 90* angle, vertical and horizontal with division line between holes. Found I do not mess up as much with the Tandy stitch pattern roller.
anyway, luck to you SouthernCross...