Then it might be an idea to get one, no? IIRC, the Dock has the Honda HDI-50 square Powerbook style SCSI port.
Another option is to mount a bare SCSI drive internally in the Dock - there is space for one. Format it using the Duo, pull it, transfer to a SCSI-equipped PC with MacDrive or some other HFS/HFS+ read/write software on it, drag the files you want over, pull it, remount it in the Dock.
Some Duo Docks came with built-in Ethernet, but it may be a socket type that is unfamiliar to you, called AAUI. Symbol: If there is one, you need an Apple AAUI to Cat-5 adapter to use it.
There are also two Nubus expansion card slots in the Dock, and Nubus ethernet cards are readily available on evilbay, as are the Powerbook SCSI cables and AAUI adapters.
Other than that, see first line of sig below.