Just testing Accel World vs. Sword Art Online on my Steam Deck Hardware.
To get AW vs SAO working on Steam Deck/via Proton you have to navigate to the games game files (Which you must do in Desktop Mode), make a copy of the AWVSSAO.exe, delete or rename the AWVSSAO_Launcher.exe to AWVSSAO_Launcher_BackUp.exe
Now take the copy of the AWVSSAO.exe and rename it to AWVSSAO_Launcher.exe, the game should now launcher with Proton.
Sadly the graphics configuration launcher tool does not work with proton, so to configure the graphics you can do what I did and configure them on your windows PC then launch the game, close it, find the graphics config ini file, and email it to yourself and place the graphics config file into the graphics config folder.
Social Links:
Twitter: / _kentun_
Twitch: / kentun