I think I've read here where someone has done it themselves, but I don't believe they were using off-the-shelf parts. Pretty sure they had to fab up the copper bits, but it seemed to work.
Might have been here or on broncofix.
The worn contact dilemma is a good reason to convert to horn relays on all earlier EB's in my opinion. Even with using an appropriate lubricant, they are under a lot of stress with the electric current and arcing.
Good luck. Obviously you know (I know you know...) that new ones come with a new turn signal switch. So I'm guessing you're just trying to avoid spending another $40 bucks for two tiny little copper buttons? ;D
Sounds reasonable to me.
Is that a replacement switch already, or an original?
Paul