Where can I find these magical screws?
We sound like f***ing bots trying to advertise stuff, ha ha.
Get anything that's stainless steel, or coated with ceramic, zinc, black oxide, or nickel. Rust happens because of iron, corrosion happens depending on other material conditions that non-iron metals are resistant to, to a point. Like, avoid tossing stainless steel into a bucket of chlorine and you're good.
Go for "M2 x 6mm" Phillips flathead or countersunk machine screws if you want the controller to be smooth, but round head is great if you don't care for the feel, or want a theoretically easier time unscrewing the thing, or you could pick a different socket type if you have screwdrivers for those types instead of a Phillips (i.e. hex socket).
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Lmao.