Don't be afraid of the Fool's Pass. I do it every shave as a test of the edge quality.South to North on the neck is no problem with a SR.
I used to struggle with neck irritation with my DE. That has been resolved after switching to SR but I’ve still gone easy. It turns out that I don’t need to. South to North is no problem and my neck is BBS. If I ever attempt a fools pass I might be there completely.
One of the first things I stumbled upon when using a straight is the benefit of moving/sliding from front to back when shaving north to south. This evening I will try the opposite. Sounds brilliant!As for my neck whiskers, under the jaw line they grow from front to rear. I found this difficult to get a DFS result there with a traditional SR until I tried and perfected a sliding action in these areas from rear to front when shaving south to north.