I think this is also a very good question for those who contribute to Plover. I don't think, given how it works right now, that Plover can make a steno machine work like a keyboard; it's the other way around right now, but that could change as new possibilities arise, such as finding and being able to purchase relatively cheap foreign steno machines. I think there was a thread around here about $300 Chinese steno machines that weren't that much different in layout from American ones.
As an aside, I really like what's going on with that Korean steno machine. I like that it has a qwerty-like layout on the keys itself. If you can switch easily from steno to qwerty, you could make "finger spelling" much faster than it is on a steno-only machine, but I don't know. Maybe professionals can finger spell fast enough that it doesn't matter, but having a 2-in-1 machine is kind of appealing. It's not like you have to use those extra thumb keys, and the other extras can just be taken as asterisk keys. I like the look of it, too. It's the slickest steno machine I've ever seen. Would you happen to know how much they cost? Mostly out of curiosity.