i dont really care for SAO that much but i think this sound s cool and might work
just so you know, ROM hacking takes tons of time and effort. if you want to make it really high quality, it could take several years to complete, especially if you have no experience in ROM hacking
im not a ROM hacker so i cant say this for sure, im just saying this because of how long its been taking a lot of hacks that i follow to be complete