Zach Savage, who is a member on BE runs wwwlastroundarmament.com . He has the stainless steel version in stock. https://www.lastroundarmament.com/product/stainless-steel-roll-pin-for-eaa-ambi-safety/
I dont know of any shooter production or otherwise that flicks on their safety between shooting positions. Everyone that I've witnessed just takes their finger off the trigger.
A couple drops of lube after the first day would probably be fine for that class. I would bring a spare extractor and slide release pin or consider bringing a back up pistol. Nothing worse than not being able to finish a class that you paid money for because your gun went down.
I put my brass in a plastic bag, spray with One Shot, shake and rub brass through the bag, spray again shake and rub again and its good to go. Takes 2 or 3 mins. I'll let it sit for about 10 mins before I throw it in the hopper.