NEC PC-9801/PC-98 series: FDS disk writing?

[wyatt8740]

Hi, simple question.
I'm well versed in the traditional advice for writing disk system games using an old PC with a parallel port or some special copier devices. But I have a friend who is wanting to get into the Famicom herself, and she doesn't have any suitably slow IBM compatible PC's with parallel ports (her oldest are Pentium 4 at multiple gigahertz). I have an 8086-based AT&T 6300 that is probably suitable, and some 133MHz Pentiums, but I am many states away.

BUT: she does have an NEC PC-9821 Ce2, which uses a 25MHz 486SX CPU. The 98 series is not remotely IBM compatible, although it does run DOS. Since the PC-9801/9821 series was the de-facto standard in Japan "back in the day," I'm wondering if a program exists for that version of DOS to do disk copying.
I see that "I-Line PC" might be a thing that exists, but it depends on hardware I do not know how to make.

I guess I might be able to modify FDSLoadr's assembly code to use the right I/O ports for the PC-98, but I'm not super confident about my assembly abilities. Especially on a system where almost all the documentation is in Japanese, a language I am still weak in despite my best efforts. I do have my own 98 clone (Epson PC-486GR) that I could use for testing, however.

I've personally been using an FDSemu and a RAM adapter for a long time instead, but she really likes the idea of using original disks and I honestly can't blame her. I think it'd be fun, too.

Edit: looks like maybe according to the readme with FDSLoadr it was the first of its kind to do this, and it was written in around 2001. So maybe it hasn't got a parallel from the PC-98 era. Additionally it looks to use 386 and perhaps even pentium instructions, so the 486 may not work. Still, I'm interested to hear what people did back then to copy and author FDS disks in Japan domestically. I know about copiers, but that doesn't explain how homebrewers did it. Unless they were able to just write files to a 3.5" or 5.25" diskette and then have the copier write it to the quickdisk?
Edit 2: of course, maybe the rumours I've heard about it not working on newer computers only really means super modern ones. Maybe a pentium 4 is fine?

Edit 3: she also has a 9821 C200 (Cereb), which uses a 200MHz Pentium CPU. Forgot about that.