I don't think 'all' metal geared servos have plastic first gears is strictly true, I'm sure my Savox 1256's used in my 1/8th are all metal. Now I have a spare 1256 which is half the speed of a 1258, but almost twice the torque, so if you are moving the ball stud to give an effectively shorter arm and therefore less mechanical advantage to the system on impacts, then you will also be reducing the effective speed of the steering as your sweep will need to be greater to achieve the same amount of steering travel/angle. I might try using the torque of the 1256 to utillise the full length of the horn to effectively increase it's speed and achieve aproximately the same performance as a 1258. With the torque hopefully achieving the same level of sytem robustness. Hope this makes sense..
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