Yes I've seen photos of this before on the Forum. Is the damage really caused by a lack of grease? Or a gear mesh issue that could be addressed with careful shimming? Or is this a case where the worm wheel should have been made out of harder material?
If it is a lack of lubrication, a sealed gearbox with a sump would have helped a little. Since these locos don't have one, I would consider using a sticky grease infused with molybdenum. The stinky black stuff that MPC used might work well on these. I once overhauled a 783 Hudson, and it was heck getting it off of my hands!