WY60 on PC

I recently purchased the Wyse WY60 keyboard from a company going out of business. The Keyboard usually comes with a Wyse terminal computer, and thus uses a funky connector (RJ10 I think) to plug in to the jack. So, I looked on eBay for RJ10 to USB adapters and found one, for around £25. I don't want to spend £25 on an adapter for a keyboard I bought for 50p. So, My initial response was, maybe I can get an RJ10 to RJ45 adapter and a RJ45 to USB adapter. I couldn't find a decent solution. My next Idea was "Why don't I make one?". Is this possible?Thanks for the help!

RJ10 Pinout:


USB Pinout: