It's funny, if Fujino had suddenly made such an ending, half of players would have come out with pitchforks and torches to look for Fujino, and the other half would have gone to protect him.
But seriously, an ending with a time shift is quite possible (not possible because Fujino can do it, but possible because it can be logically explained. Although if you give him a lot of money ... who knows.) Fujino can easily make such a small moment that Kirito has not just a SEED in his head, but an implanted chip with a SEED (although maybe it is?). In the canon of Fujino, there are such incomprehensible things as the goddess Queenella, the world of dreams, so a few more fantastic things won't spoil anything.
Therefore, it is possible to implement a plot in which Kirito finds out about everything, is horrified and the Administrator tells him a way to fix everything, on the condition that he takes her data into the past so that she can realize her plans a little earlier. Kirito sends his identity and memory back to the past, using FOG servers. Kirito enter into the core of FOG and downloads his own personality ( Anyone who has played the SOMA game will understand the "joke" with a copy of the personality ) cast from his chip and sends it back to the past with the help of *Dr. Fujino's magic technology*. Then, sometime in May 2026, the day before he met Inoda, he wakes up and realizes that everything has worked out, and the first thing he does is go into the woods, find a wounded Inoda and stick a sword in his ass, then go to the school bullies and for a small reward they turn Inoda into a punching bag. Well, etc. As far as your imagination is enough.
This option can be implemented without much controversy. But, as usual, a lot of people will shout that this is NTR and a good ending is impossible. But I can tell them that everything has its price.
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P.S. But I really wonder if Kirito found out everything at all - Asuna's betrayal, how Asuna was held by Sugo, Suguha and Sinon's relationship with Hebeshima, Liz's plans - would he save them and change their fate? Well, apart from Suguha, she's a sister after all, and she got to Hebeshima out of stupidity, I think Alice is the only one who really deserves to be saved from her fate.