or you could have Relokick, or softkick which puts a rom image in the bottom section of memory and allows a soft reset to read the 1.3 rom image in ram instead of the actual 3.1 rom off the mainboard.
probably on aminet or somewhere.
i seem to rememnber a fair chance of success using it, but not 100% depending on processor and chipset.
1.3 rom will only initialize hardware it understands, so even on an AGA chipset 040+ machine it works.