Looking around the forum I see that the problem with editing AVCHD files is ubiquitous, and is a bottleneck building up pressure out of peoples's video needs. I believe it will blow like a cork from a champagne bottle when a solution comes forth.
It looks like I'm going to have to upgrade my computer, which I was going to do, only via Intel instead of AMD. This means I may have to opt for the lower spec camera model. It seems things are being decided for me regardless of my wants.