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Sorry, Illustrator has no such ability. Custom plugins, toolbars, 3rd party hotkey applications or even the faulty Actions with script as menu item (not recommended because they have problems on restart) are our only ways to run scripts without using ESTK or File > Scripts menu item.
If you have not more 12 frequently used scripts, you can make that prefixes to script names: 1, 2.... -, =. Then you can invoke the scripts like this: Alt>F>R>your script prefix. I'm use that "feint ears" some time.
But now I came to the conclusion that it is much more convenient to use a separate scripts panel. Why not?
But since you are not interested, then I wish you success in further researches.