Basically the options are (a) a real disk ( B) networking.

Use a Mac running system 7 or above with either more real memory or virtual memory turned on, mount the disk and create a real floppy.

If you can't do that, use the Basilisk II emulator on a PC to do the same thing but you would not be able to write an 800Mb disk, but you could copy the files and then use file sharing to let the other mac see them if you have the appropriate networking.