The problem with any kind of skid shoes is that unless the gravel is frozen the skid shoes will have a tendency to dig in and still let the blade gather gravel. Even more so if your stones are a few inches deep.
For the past 28 years clearing multiple gravel drive ways with a rear blade (9N and 2720) I find the most effective technique is to leave the blade facing forwards and push backwards against the curve of the blade. This really minimizes the tendency for the blade to dig in. By doing so it still gives the option to scrape forward if you encounter packed snow or ice to loosen it up.
i haven't tried the edge tamers yet. For 12 years I "plowed" by angling the bucket, in essence I figure liike one large Edge Tamer and floating the bucket. I put a WoodMaxx SB in service last year reversing the cutting blade, again like the Edge Tamer and set the skids to ~2" of relief, the skids are shaped like Edge Tamers with about half the surface area. I still get tear-out.
I like your idea of "plowing" with the back of a back blade, some might refer to it as back dragging, I haven't tried it yet as I just got the blade and haven't mounted it yet in place of the rake on my 3046 . How much packed snow does it leave vs. push, and how effectively does it windrow. Do you really push it or do you turn it around and drag it?
Just to clarify the SB is mounted on a 2520 and I intend to mount the blade on a 3046R; leaving the bucket in front for pile clean-up and back dragging.