Maybe you will find a suitable solution if you search for Hot Reload.
Hot Reload
Hot reloading with VSCode and also debugging with VSCode
Hot reload in Godot (instantly see changes without reloading a game)
There are also some pull requests, it may be improved in the future.
Github PR "reload: "Pull requests · godotengine/godot · GitHub
You could also compile your own Godot Editor if you don’t want to wait long.