My advice would be to skip it and purchase a PS/2 to USB converter. This device could work for that, I'm sure, but your main interest right now is checking those keyboards and it would be too much trouble, I think, to make this host emulator work for you.
Just buy a converter, try out the keyboards, and later on you can play with this host emulator and programming.
That thing sounds pretty cool, and you gotta like a company whose slogan is "The No Slogan Company".