toes 5 til 2 (on analog clock)
This would mean that your right foot is more turned out that your left, wouldn't it?
Do you mean 5 til 2 based on the line of dance (being at 12 and 6) or 5 til 2 based on the person's own body alignment?
If the latter and someone is trying to dance a true milonguero style, I can't imagine that would be helpful. I think it would be actually detrimental to aim for that lack of symmetry.
As for a V embrace or some other styles, I still question whether this is useful. It's certainly not something I've EVER heard nor would I want a beginner to focus on that sort of thing so exactly. It's hard enough to get them to stop looking at their feet. You start talking about their foot position that specifically, they're never going to look up!
If you want them to angle themselves along the line of dance (not have one foot turned out more than the other) I think there are better ways to instruct this angle than giving them foot positions, not only because of the looking down thing, but because foot positions don't always create a corresponding body position.. I think it would be better to talk about how their whole body is situated along the LOD, The way they step can play a role, but it is not the only piece of the puzzle. Giving foot positions without context of body positions can be tricky