That’s really cool! Glad to see you folks getting into doing your own switches. I’ve been enjoying your springs for a while now - I think this only makes sense as a next step.
I think the community really does need a name for stability-focused stem shrouds; plenty of manufacturers do use “box” but as you pointed out, that does carry with it some confusion about Kailh’s semi-sealed contact system. I think even “dust-proof” caught-on as a misnomer because that’s part of the purpose of those sealed contacts - add to that most people just thought Kailh’s switches were called “boxes” because of their square stem shrouds, and we have all the perfect ingredients for a big pile of ambiguity. 
I think I’ve heard some people call them “walled” stems - I feel like that’s short, simple, and descriptive enough that it could work. Whatever it ends up being called, I’m a big fan of the housing rails having more surface to stabilize against and how that makes a switch feel - so high-five for making that a key part of your design here.
Speaking of walls and shrouds and whatnot - the one on the Quarks looks a bit like those produced by Haimu - is that who you have doing the production? Quite a few of my more recent favorites from different vendors came from their factory. Either way - these sound like a great fuss-free switch - I hope they do really well!