Okay, after reading through the other thread, I downloaded Peter's Romsplit program. There may have been an easier way to accomplish this, but here's what I did:
1. Got Romsplit and the 1.04 image file I wanted to split transferred to my ST HDD.
2. Split the image file into 6 files.
3. Copied the new rom files to a blank .st file loaded on my Gotek.
4. Using Steem, copied the split files out of the .st file onto my PC HD.
I now have 6 32K files with the following file extensions: *.HI0, *.HI1, *.HI2, *.LO0, *.LO1, *.LO2
So, I could now burn these to 27C256/29C256 eproms using a TL866II and hopefully be good to go?