So it turns out both of your suggestions work - renaming the “Corner” to “corner” removed the italic angle to that specific glyph, but then the path could be modified/redrawn as if it was upright and then is bent/warped into position when applied to the parent glyph.
But in this case, I think using the “origin” trick makes the most sense to have the most control over the paths and prevent unwanted distortion when the italic angle is applied to a path drawn for an upright/roman letter. Also, didn’t need to rename “C” to “c” in this case either.
Good to know both are options that solve the issue, thanks!!