I finally got around to taking some pictures of my current SWC/M flash grip setup. I've found surprisingly little information on left hand grips for the SWC. Possibly because most don't need one. I find it very convenient, and for the way I like to use the camera, indispensable.
I've been using the Vivitar PG-1 left hand flash grip, with the CB-66 base plate. The grip has a rotating cold shoe and a replaceable/removable cable release. Both features are essential for me. I attached pictures of the setup I've been walking around with for about a month (less the neck strap).
This suits my needs well, which are to be able to shoots comfortably during the evening hours with a speed light in my right hand wirelessly triggered. I like to be able to do as I wish with a flash rather than have it fixed near the camera.
While I'm finding this a good solution, there are two issues that I'm not sure I can live with in the long-run. The first regards the distance between the camera and the handle. At its closest (as shown) the camera is about 4 inches from my wrist. I think this handle was primarily designed for larger medium format bodies. This didn't seem an issue until several hours of lifting the camera to my eye repeatedly. There is a twisting force applied to the wrist that really wears me down. The second issue regards the attachment of the camera to the base plate. This is straightforward, except when I need to use a tripod or want to use the camera without the grip it becomes a PITA. Quick releases for camera and tripod could be adapted but would add weight at the very least.
I'll keep this setup for now, but I am eyeing the Hasseblad 45169 grip which appears to be perfect for the camera
I hope this is helpful to some....