"I find regularly that links change, and mostly to another filename on the same website. "

This means that the 'designer' of that website is not very good - mostly hopeless! If 'important info' is needed to be available for a long time, then that page should never change, other than become a redirection or index page.

"The JavaScript to redirect a page to a new page is about 3 lines including the JavaScript TAG /TAG."

And is also easily broken, especially by those who refuse to allow it to run anyway.

"links change, and mostly to another filename"

This is the reason usually given my many designers in the early days (Ah! I remember them...) to NOT provide links to internal pages... The anchors to internal page sections gets much the same response.

While I think your motives are admirable, from my experience mate, you are pushing a sloppy one uphill with a pointed stick... :0