That could (in theory) work. First you (or someone else) have to create an USB Port in Verlog and implement it into the Amiga hardware. Then this USB Port has to be adapted as an Amiga floppy port and then the data stream has to be synchronized.
In that case DD and HD floppy disks could be used due to the internal adaption to the different ports.
USB just need 2 wires and Spare-I/O offers it. +5V to supply the external USB Floppy will be gain directly from the power plug.
To be honest I can not do that by myself. If some developers would work together, it may be possible.
