I've written a small program to dump the Amiga 1000's boot ROM data to disk. It seems to work fine testing with WinUAE, but can someone with a real A1000 test it?
A (compressed) ADF disk image is attached. Just write that to an Amiga floppy disk, then boot your A1000 with it after loading Kickstart.
There's a .readme file on the disk which you might want to read.