I see a problem tho, the floppy don't go nicely with the car enviroment and they will probably become unreadable pretty fast.

I had a similar idea but i wanted to embed small nfc tag into some floppy disk and use a broken floppy reader that i own with a tag reader inside the gut of the reader reusing only the eject mechanism and the led, (i will be missing the nice motor noise tough...).

I'm also experimenting with other cartridge-style meccanism