Convert bootable MSDOS floppy to bootable MSDOS CDROM with extra material

I have a bootable MS-DOS floppy disk.  This disk's autoexec.bat 
currently depends on an old ZIP drive being attached to the zip booted, 
from which it then copies a bunch of files to the hard drive. 
(Obviously, this is an ancient system).

We would like to change as follows - create a bootable MS-DOS CDROM with 
these changes from the floppy

1) revise config.sys if needed so that CDROM drive is recognized
2) add all the files that previously copied from zip drive to the CDROM 
image.
3) revise autoexec.bat to copy files from the CDROM

Is there a way with mkisofs to take the floppy image, work with the 
image, add to the image as detailed above and then write a new ISO image 
that can be burned to a CD that would be bootable?


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