That's the method the civic 4g guys use to flush out their handles (use the back ones from the sedan) but I doubt anyone hates that tiny hole enough to shell out dealership money for some handles.
I'll go out tonight with the digital micrometer and measure that hole, then we can see which one would fit. It seems like those guys from key techniques are all about this, and if there's enough of us, and could be urged to buy some Lexus paint pints.
19mm at the outside of the hole which tapers to 14.2mm at the smallest/innermost point where the metal of the lock begins. I'm sure that something either 19mm or 14mm would do depending on your desired look.
Can't really say if they will work or not because it depends on how they attach. If they are just plugs then they will might fall out because of the taper. For only ten bucks, it might be worth testing it though. I'll defer to another member for that trail run.