There's a module available here, and there are links on the page to documentation - I'm sorry I didn't reply sooner - I don't check this forum very often.
Thanks guys for taking note of this! Unfortunately the project I was looking at these for has since fallen through, though these may be useful in the future.
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https://www.tindie.com/products/matzelectronics/ch559-usb-host-to-uart-bridge-module/
Edit, sorry - I misunderstood the requirements.
USB Host - Keyboard to ASCII Converter | USBHOST-KEYBOARD | HobbyTronics
https://www.hobbytronics.co.uk/usb-host-keyboardPIC Based but works really well.
The VNC2 is only about $4, see the V2DIP2-32 datasheet for a layout of a module.
Thanks guys for taking note of this! Unfortunately the project I was looking at these for has since fallen through, though these may be useful in the future.