When the Case Colours Go - Is it Possible to have them Replaced with Rust Blue?

[Tony Guccioni]

Good Day everyone, My name is Tony and I've just discovered a new addiction.
I've been collecting Winchester model 23's for a while and was progressing towards Classic Doubles branded guns until a friend commented that they look like Parker Repros. I said Parker WHAT!

There is so much to love about these beautiful guns.... except the (assumed) ease of wear of the case colours. I'm looking for a 12 Ga. for Sporting Clays and expect to fire up to 1000 shots with it per year.
With average handling by the average Joe (me) how long till Case Colour wear becomes apparent?
And when wear does become too much to bear would it be possible to replace all of case colouring with rust blue. I suppose all of the metal work will need doing for the sake of uniformity.
Thanks in advance.