Hi Alan,
Before you continue this, make sure that each tested floppy is locked (with the slider in its write-protected position) in order not to overwrite or erase anything.
If your LC is fully operational, it is not a bad idea to make a set of 1.44 MB copies of the existing floppies.
If PC Exchange is in the Control Panels folder on the LC, you could easily copy files to PC-formatted 1.44 MB HD diskettes as well (with PC Exchange installed, a PC-formatted floppy will appear with a "PC" icon on the Desktop). Otherwise, you may want to try to find Apple File Exchange (see above).
Also, have you tried one of your 1.44 MB Mac floppies in a PC that has a Mac-to-PC disk handling utility?
TransMac, as mentioned above, is one example. There used to be an old freeware program called HFVExplorer; it seems to be somewhat difficult to locate (Google) these days.
If someone with the necessary expertise can help you connect the internal SCSI hard drive to another Mac, and transfer the files, why not?
Jan