Nice one David!!
Actually, 1 and 2 did not work for me. #3 however, was the winner!
I played with the snap lines a little before posing the question and somehow overlooked the boundary vs. geometry setting (might have something to do with the pre-Wildfire menu mangler interface).
Now, the bad news is that orienting snap lines to geometry really su.. is disagreeable. If there are multiple notes, there will be snap lines all over the place and the user will probably spend quite a bit of time adjusting.
To me, this workaround doesn't make up for the bad programming and PTC needs to fix it. I will continue harassing PTC (they are "researching the issue").