Afaik there is 1.3 (34.5) for A3000.
Normally you can use 2x27C400 EPROMS (=2x512KB=1MB) and burn a dual Kickstart 1.3 (512KB) + 3.1 (512KB) to them.
Ofc they need to be dissected but nothing difficult with Remus.
Then in order for changing the banks you'll need to use a dual 3way switch with first couple going to +5V (with a resistor of 4k7) the second couple going to Pin1 of both EPROMS and third couple to GND.
