SK does offer a 1/4 driver spinner handle with the 1/4 square drive female end on the top of the handle.
https://sktools.com/shop/1-4-drive-spinner-handle-extension.html
Yeah I was gonna say that I've an SK spinner with a female drive at the other end. It's got a green handle, not black. I got it to replace a Craftsman spinner that I found on the windshield wiper cowling a few weeks after the SK one arrived. What I really miss from the SK catalog was that 1/2" breaker bar with a female drive at the other end. Lost that one to the junkyard ages ago.
Unfortunately while trying to figure out how long ago I bought that SK spinner I realized why I don't buy SK anymore. For the price I expect chrome that's not going to flake. Or at least some sort of retail distribution / warranty service. The last time I pinged SK their list of distributors was out of date and they had no idea who actually distributed their stuff. At least with SnapOn I can ambush the truck easily enough (although for that kind of money I expect ****** favors).
Edit: Two years later and the SK web site is still garbage. Try searching for 87759. No results, but it suggests "87759 wrench". Try that. Get a few pages of unrelated results. Go to Zoro.com, search for 87759, first result is that $35 wrench you need to get replaced.
List price on the SK spinner is $30. If you're willing to spend $30 on that you may as well spend $40 on the Snappy.