You have given this good consideration. Great. However, you are not likely, to get specific replies, I think, and I don't have one, either.
- As for the tool, it looks like a fork that pushes back the clips that are holding the switch cover. You can probably make this, yourself. Is a paperclip too thick?
- As for replacing parts, or the whole switch, you have the information, to make the consideration... Availability of parts, their cost, your time and effort, etc.