Actually, I'm looking for a plugin that can trigger common events (or directly plugin commands) while the player is selecting commands in battle. I believe this plugin can do the trick. For example, if the player presses 'A' while choosing an action and certain conditions are met, it could launch a specific skill directly —but it should be possible to go back to the actor commands if the player changes their mind. This is a mechanic similar to Persona 5 Royal’s Showtime Attacks. (And is not too intrusive in the UI if possible, since I'm using the sideview ui plugin from Visustella)
The plugin works just as you described; the only thing it doesn't do natively is use common events. You have the option to use either battle skills linked to hotkeys or commands from other plugins. I could adapt it to use common events, but that introduces complexity regarding conditions. Honestly, I think it would be much better to simply associate the common events with the skills, since that is a native RPG Maker feature, because if the skill's conditions are met, the common events would execute normally.