There are many low cost Wiegand to USB converters, but unfortunately they rarely work as required.
If something is not available on the market, you have to build it yourself.
We now have a solution for you:
Power supply via USB.
Wiegand input 26,34,27,42,44bit with parity checking.
Output decimal or hexadecimal.
Length of output string selectable 40,32,24 or 16bit.
Output as Human Interface Device (HID class)