Unless he actually meant to say: Put both kick and workbench 1.3 into EEPROM....
With an A1000, that had no Kickstart ROM, there was a product I used extensively called KickWork that included both the Kickstart and the Workbench on one floppy. The Workbench was modifiable so that hard disk devices could be added, the Startup-Sequence edited, etc. (Of course, it helped that Kickstart was only 256K in those days.)
These days, it's easy to get EEPROMs bigger than 2 floppys, but I don't know if an A500 could access much more than 500K in that memory region. Plus, usually KS looks for a disk device to load WB. I do have a device that starts an A500 from ROM that goes on the 86 pin expansion, that came from a arcade game, but it may be set up as a Zorro device.