I
EDIT: I forgot to mention MKick to you. MKick works under Kickstart 1.3, and people us it to softkick 3.1 on 1.3 systems. I haven't used it myself yet, but I plan to do so later this year when I get around to finishing my A500 project. So you could use your 1.3 ROM chip if you wanted to and then softkick 3.1. Perhaps you can softkick 1.3 from your 3.1 system too.
MKick:
http://aminet.net/package/util/boot/MKick19
Excellent. Now I'm up to my ears in things to try.
Can't wait for the ROM switcher to arrive.
I hate taking apart the A2000 to switch ROMs (for Bridgeboard, and OS trials).
I did contact the seller of the Kickstart 1.3 ROM, and since he didn't ship my package yet, I paid ($4 more) and got a Kickstart V2.04 ROM at the same shipping cost.
So my ROM collection will be:2x) Kickstart 1.2 [315093-01]
1x) Kickstart 1.3 [315093-02]
1x) Kickstart 2.04 [390979-01]
1x) Kickstart 3.1 (V40.63)
Few weeks ago I ordered one of these 40 pin ZIF ZIP sockets ($3 Aliexpress) that
I plan to MOD the ROM Switcher with, for a easy SWAP on one of the ROM.

It will be extended out from underneath the A2000 Drive Carriage
with a Ribbon Cable/PC-board, so I can easily change ROMs if I wish.
With that setup I'll be able to play enough, to arrive at my favourite 2 Permanent ROMs when I close the AMIGA Case.