You can find slopes in Deadeye's platform school 4, in the tutorial list... not sure if the file is accessible now, but it should be around.
Admittedly, this is the first place I thought to go for help, haha. One must note however that while these files are still available, there are a couple issues with the suggestion that they can help with slopes in cases like mine:
1) When Deadeye remade Lessons 1-5 to reflect the better platform behavior and improved overall coding in the "finished" Construct Classic, slopes were mysteriously cut out from Lesson 4 and are, in fact, not found in any of the remade lessons.
2) If you're referring to the old Platform School, then yes, slopes are included, however... they are programmed with the hitbox as a separate object. I mentioned in the original post that I'm using one object as the character rather than a pair of objects (collision detection "real" character, animated dummy). I don't know if that programming can still be applied to my situation with a little rejiggering, but from what I've heard it's pretty archaic programming as it is.
And yeah, I've searched high and low across Scirra's forums here and the old site's forums to try and find a trace of slope-traversing advice. No such luck! :(