Yes, they will work, but you are right in stating that you should have additional RAM. 1.0 to 1.3 kickstart ROM's were 256k, but 2.0 and above were 512k. I know others have installed 3.1 ROMs in their A1000's, so I know they work. I think I would rather get another model of Amiga to run 3.1 or higher AmigaOS on, but that's just me. Good luck.