My reading about Shimano freehubs suggests there have been principally two: Uniglide and Hyperglide. Examining the spline pattern of mine as compared to pictures of Uni and Hyper, it would seem to be neither, and yet I find no mention of this mysterious freehub body. What is it?

More info:
The wheel is from a circa 1985 Schwinn Super Le Tour (though likely irrelevant, as I don't think it is original to the bike). 6 speeds - 3 cog cassette followed by spacers and 2 more cogs that drop in place, and the smallest that threads on with integrated spacer. The cogs that drop on only do so in 1 orientation (Hyperglide-like?). The splines follow a wide-narrow-narrow pattern, and the narrow ones are rounded, except for one. They seem to protrude less than pictures of other freehub bodies I've seen. The outer ring (which I've not removed) reads "HC Shimano China." I see no markings on the hub itself. I think the OLD of this hub is about 124mm (that is the spacing of the dropouts anyways).

What am I trying to do anyways?
I'd like to turn the Super Le Tour into a 1 speed bike. I actually have a Surly cog on order which, despite being "designed to fit on standard Shimano compatible freehub bodies," I fear is not going to fit on this one. I've seen videos, articles on swapping a Hyperglide body onto a Uniglide freehub ... not sure if that could be done in this case as I think the body is quite short (haven't measured it).

I would consider a new wheel, though I'd rather not "cold set" frame to increase the dropout spacing. I've wondered if I could pull them apart enough for a 130mm OLD hubbed wheel (haven't tried), though even if I could, I'm not sure I'd know what to look for ... maybe a wheel that just takes a BMX freewheel, or a wheel with the shortest Hyperglide cassette you can get?