"FDHD Roms" is something I had to look up.

If I understand this correctly, to use one of these external floppy drives would require something older than an SE30, which is the oldest machine I have at present.

So, either I give up on the idea, or look for an unfindable DanaFile, or find an SE or such and the additional bits and pieces to do this with – or, indeed, revive my PC/XT silicon dinosaur. Hmmm, can I still do DOS, I wonder?