Build yourself a Greaseweazle.
https://github.com/keirf/Greaseweazle
Or buy a Kryoflux, or Supercard Pro.
To be clear though, there is no device, (that I know of anyhow) that will let WinUAE etc let you access an Amiga floppy disk in real time.
All the above will let you create an image of an Amiga disk, and use that image with the emulator.