I've spent a couple hours trying to find effective saves, but have only found one so far. Thoughts?
I tried this one myself. Same exact behavior as your video. The one thing I thought of and tried was to control myself as I was falling down the maze runner hole, and then past the white platform. I thought maybe you could walk through and land on the map somewhere where you could walk through the maze, but that doesn't seem to happen; you just fall through the platform. It seems that the maze runner triggers that part of the map to become active. (Notice how it's all black? So is the maze normally, until the runner lands on the first platform, then the lights come up.)
I doubt walking on the tracks would be possible, unfortunately. Anything that Cyan didn't expect you to walk on doesn't have collision (except for, apparently, the bottom of the lake in Selenitic Age)
Demonstration (with distorted sound, thanks YT) of a more effective save closer to Sirrus's page in Selenitic - still working on finding saves for other ages.
And here comes a massive glitch in conjunction, C-Jumping
I'm not sure that saves as much time as you think. You still have to get into the lighthouse, turn the crank, and then click on the floor compass to activate the book back to Myst. (I checked.) So doing that glitch just lets you get the page ¤first¤, instead of faster.