I can already tell you that any FTDI chip (Viniculum uses FTDI chips) are designed so that they are recognized as a USB device, it is their non reprogrammable firmware, so you won't be able to put this between a keyboard and a host, it will interfere and thus make the keyboard not working. I just bought a couple to try and use it, and contacted their tech support, which confirmed this
As for the other chip, USBN9604, i didn't look at it yet, but there is a good chance it works the same, therefore unusable for such applications.
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