Q: Amiga 3000 Kickstart

[Zac67]

AFAIK the 3000 can use A500/2000 ROMs. You'd need two identical ones and set the jumper appropriately. (The jumper configures a kind of interleaved mode and you'll need 32 bit access.)

Only drawback is the lack of "A3000 magic", i.e. 32 bit fast RAM and SCSI won't work.

[Zac67]

Also 16-bit A500/2000 ROMs CANNOT be used in the 32-bit A3000 computer.

Have you tried? I found this out a few years ago and from the schematics it looks fine (see my post above).