Thanks.  Yeah, I see the chamfering, and it impacts the workflow slightly, so I just went around the model, selecting an edge, holding down CTRL, then selecting the next edge with CTRL-SHIFT, which selected a loop, then moved to the end of that loop, and selected the next edge with CTRL, then SHIFT-selected the next edge to get the next loop in the direction I wanted to go, etc.  Got around the entire model in about 25 min with that technique.  The trick is finger placement on the hotkeys.

Then I decided to try selecting the edges with the Hard button, which selects all hard edges. That may have been the solution to automate this for you, because when I pressed that, it grabbed all the outer edges of your chamfer nicely, around the whole model.  I imagine if the chamfer wasn't present, it would have grabbed at least 90% of the edges you wanted, and all you'd have left to do is CTRL-select the remaining edges, or fix the selection, if it wasn't exactly right.  Probably saving you a lot of time.

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